WO2006018879A1 - 多焦点型着色コンタクトレンズおよびその製造方法 - Google Patents
多焦点型着色コンタクトレンズおよびその製造方法 Download PDFInfo
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- WO2006018879A1 WO2006018879A1 PCT/JP2004/011903 JP2004011903W WO2006018879A1 WO 2006018879 A1 WO2006018879 A1 WO 2006018879A1 JP 2004011903 W JP2004011903 W JP 2004011903W WO 2006018879 A1 WO2006018879 A1 WO 2006018879A1
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- Prior art keywords
- colored
- contact lens
- region
- optical
- multifocal
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
- G02C7/04—Contact lenses for the eyes
- G02C7/041—Contact lenses for the eyes bifocal; multifocal
- G02C7/044—Annular configuration, e.g. pupil tuned
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- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
- G02C7/04—Contact lenses for the eyes
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
- G02C7/04—Contact lenses for the eyes
- G02C7/041—Contact lenses for the eyes bifocal; multifocal
- G02C7/042—Simultaneous type
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/10—Filters, e.g. for facilitating adaptation of the eyes to the dark; Sunglasses
- G02C7/105—Filters, e.g. for facilitating adaptation of the eyes to the dark; Sunglasses having inhomogeneously distributed colouring
Definitions
- the present invention relates to a multifocal contact lens in which a plurality of focal lengths are set in an optical region.
- a multifocal contact lens (including multifocal lenses and bifocal lenses) in which a plurality of focal lengths are set in the optical region is used.
- a multifocal contact lens (including multifocal lenses and bifocal lenses) in which a plurality of focal lengths are set in the optical region is used.
- it is used for correcting presbyopia.
- Patent Document 1 Japanese Patent Application Laid-Open No. 07-239459
- Patent Document 2 Japanese Patent Laid-Open No. 06-250127
- An object of the present invention is to provide a multifocal contact lens that can be used.
- Another object of the present invention is to provide a production method capable of advantageously producing such a multifocal contact lens having a structure according to the present invention.
- a first aspect of the present invention relating to a multifocal contact lens is a multifocal outer contour lens in which a plurality of focal lengths are set in an optical region, and a predetermined focus is selected from the plurality of focal lengths.
- a multi-focal colored contact lens is selected by selecting a partial optical region with a set distance and using the selected optical region as a colored transparent region having a color different from that of another optical region with a set focal length. It is characterized by that.
- the optical area of the multifocal contact lens is divided into a plurality of areas in consideration of the set focal length, and at least one of the divided areas
- the selected optical region is a colored region different from other regions.
- the contact lens wearing This makes it possible to adjust the visual appearance of a person even in a powerful range that cannot be achieved by adjusting the deviation of the optical range and the power change rate.
- the multifocal colored contact lens according to this aspect, specifically, the following aspects and those described in the embodiments are conceivable.
- the basic idea of the present invention is that, in a multifocal contact lens, by providing a colored structure in combination with a set lens power region, the optical characteristics of the multifocal contact lens can be reduced.
- the degree of freedom of adjustment (tuning) is given. Therefore, what kind of optical characteristics should be adjusted based on the coloration of the selected optical region is not limited. It is various and free depending on the required optical characteristics and individual wearers. It should also be understood that all such adjustments are included within the scope of the present invention.
- the “color” in this embodiment includes colorlessness. Therefore, it is understood that the colored transparent optical region and the colorless transparent optical region have different colors. That is, the other optical region of the selected optical region that is a colored and transparent colored region may be colored and transparent with another color, or may be colorless and transparent. Of course, there may be a plurality of selected optical regions that are colored and transparent, without being limited to one. The plurality of selected optical regions are colored and transparent colored with different colors and densities as specified in the embodiments described later. It may be the optical region.
- the multifocal contact lens having “a plurality of focal lengths” for example, (i) optical regions in which a region having a constant focal length spreads over a predetermined area are different from each other.
- Infinite number of focal lengths set by continuously changing focal length Also included is a progressive multifocal contact lens in which a portion is present.
- the "partial optical region in which a predetermined focal length is set" in this aspect means (i) a part (one) in a split multifocal contact lens of alternating vision type and simultaneous vision type. Or a plurality of focal length setting areas, and (ii) a focal length setting area of a predetermined range in the progressive multifocal contact lens.
- a partial optical region in which a focal length within a predetermined change range is set as a selected optical region out of gradually changing focal lengths is appropriately selected. I can do it.
- all of the optical regions having the same focal length are set as one selected optical region, and the same selected color region is colored with the same density on the entire selected optical region. It is not essential. Specifically, for example, an optical region having the same focal length may be partially colored as the selected optical region. Also, the color density (light transmittance) may be gradually changed in one selected optical region.For example, at the edge of one selected optical region, the light transmittance is gradually increased to create a blurry region. It is also possible to make.
- a second aspect of the present invention relating to a multifocal contact lens is a multifocal colored contact lens structured according to the first aspect, wherein the optical region has a focal length for near vision. And a distance optical area in which a focal distance for distance viewing is set, and only one of the near optical area and the distance optical area is the selected optical area. It is characterized in that it is a colored transparent region.
- This embodiment is an embodiment in which the present invention is applied to a multifocal contact lens for presbyopia in which a near optical region and a far optical region are formed.
- contact Toren's wearer's power Contrast can be improved by coloring only the corresponding near- or far-distance optical areas when complaining of invisibility for either near vision or far vision. Is possible. This effectiveness is clear also from the data of the Example mentioned later.
- the formation positions of the near optical region and the far optical region are not particularly limited, and various modes can be selected, and any of the near optical region and the far optical region can be selected. Alternatively, it may be formed at a plurality of locations without being limited to one location. Further, the near-field optical area and the far-field optical area in this embodiment are not limited to those in which a fixed focal length is set over the entire area as described in embodiment 6 described later. Appropriate tuning may be performed, and the focal length may be set so as to change in the near optical region and the far optical region. Alternatively, as described in Aspect 7 to be described later, other optical regions other than the near optical region and the far optical region can be provided together in the optical region.
- a third aspect of the present invention relating to a multifocal contact lens is a multifocal colored contact lens structured according to the first aspect, wherein the optical region has a focal distance for near vision. And a distance optical area in which a focal distance for far vision is set, and both of the near optical area and the distance optical area are the selected optical areas.
- the region is characterized by being a colored and transparent colored region having different colors.
- This aspect is an aspect in which the present invention is applied to a multifocal contact lens for presbyopia as in the second aspect.
- a multifocal contact lens for presbyopia for presbyopia
- both near and far optical regions are colored. Therefore, it is possible to improve the contrast in both near vision and far vision. This effectiveness is clear also from the data of the Example mentioned later.
- the formation positions of the near optical region and the far optical region are not particularly limited, as in the second embodiment.
- the near optical region is a blue colored region. This is a feature.
- blue refers to blue transparency, and expresses blue transparency by transmitting light in the blue wavelength region.
- the light transmittance in the blue wavelength region is sufficiently larger than the light transmittance in the wavelength regions of other colors.
- the transmittance of light in the blue wavelength range is visible so that everyone can see that it is blue transparent. This is realized by making it larger than the transmittance of light in a specific wavelength range.
- the light transmittance in a visible wavelength range for example, a wavelength range of 380 to 780 nm
- a visible wavelength range for example, a wavelength range of 380 to 780 nm
- the light transmittance in the visible wavelength region is maintained at 70% or more as the total value of the optical region, and more preferably, in either the near optical region or the far optical region. Even in the area, the light transmittance is set to 70% or more as the total value.
- the distance optical region is yellow. This is characterized by the fact that the colored region is formed.
- the near optical area is made a blue transparent colored area
- the far optical area is made a yellow transparent colored area, thereby improving both near and far contrast. Is possible.
- yellow means yellow transparent, and light rays in the yellow wavelength range. By making it pass through, yellow transparency is expressed.
- the light transmittance in the yellow wavelength region is sufficiently larger than the light transmittance in the wavelength regions of other colors. In other words, when white light is transmitted through a light source, the transmittance of light in the yellow wavelength region is visible so that everyone can see that it is yellow and transparent. This is realized by making it larger than the transmittance of light in a specific wavelength range.
- the light transmittance in the visible wavelength range is maintained at 70% or more in order to maintain the overall visibility easily. Is desirable
- a sixth aspect of the present invention relating to a multifocal contact lens is a multifocal colored contact lens having a structure according to any one of the second to fifth aspects, wherein the near-field optical region and the far-field In the optical area for use, a substantially constant focal length is set.
- This aspect is a multifocal type represented by a bifocal contact lens for presbyopia in which a near-field optical region and a far-field optical region are formed by setting a substantially constant focal length. It is one mode in which the present invention is applied to a contact lens. According to this aspect, since it is possible to clearly distinguish the near optical region and the far optical region in the contact lens, adjustment of each region by coloring is also clear and easy.
- a seventh aspect of the present invention relating to a multifocal contact lens is a multifocal colored contact lens structured according to the sixth aspect, wherein the near optical region and the far optical region A transition region is formed in which the focal length is gradually changed between the focal length of the near optical region and the focal length of the far optical region. Also, the selection optical region is a colored and transparent coloring region.
- the above-described contrast improvement effect can be expected, and the visible region can be used for near and far optical regions by coloring the transition region. It is expected to improve the visibility of near and far distances by reducing ghosts and the like.
- An eighth aspect of the present invention relating to a multifocal contact lens is a multifocal colored contact lens structured according to the first aspect, wherein the optical region has a boundary where the focal length clearly changes. It is a progressive multifocal type in which a plurality of focal lengths are set by gradually changing the focal length without having a line, and an area having a predetermined focal length is set as the selected optical area and colored. It is characterized by being a transparent coloring area.
- the effect of the present invention is effectively applied to a progressive multifocal contact lens that does not include a lens surface that has a constant focal length and spreads to a predetermined size. You can get it.
- the types of colors to be colored may be one kind or two or more kinds, and the number of colored areas is not limited. It is the same as the multifocal contour lens provided.
- a ninth aspect of the present invention relating to a multifocal contact lens is a multifocal colored contact lens having a structure according to any one of the first to eighth aspects, wherein the colored transparent colored region is It has a light transmittance of 70-98% with respect to visible light.
- Visible light generally means light in the wavelength range of 380-78 Onm!
- a tenth aspect of the present invention relating to a multifocal contact lens is a multifocal colored contact lens having a structure according to any one of the first to ninth aspects, on the outer peripheral side of the optical region.
- the outer peripheral edge of the lens extends in the circumferential direction and does not directly contribute to the optical characteristics of the eye optical system, but the peripheral part is formed and the peripheral part is not present. It is characterized by being transparent in color.
- the peripheral portion is colored. It is made colorless and transparent. As a result, when the contact lens is displaced or exerted with great force, and the outer peripheral edge of the contact lens reaches the sclera of the eye under the wearing state of the contact lens, the outer peripheral edge is colored. As a result, the contact lens can be easily visually recognized with a special color and strangeness can be avoided. Moreover, optically, the above-mentioned effect due to coloring is not reduced at all.
- colorless in the present invention includes a case where a contact lens that is completely colorless is easily found, and is slightly colored blue or the like in order to improve handling. This is because such a slight coloration can hardly be expected from the optical effect due to the coloration and is applied without expectation and is recognized as the ground color of the contact lens. .
- the peripheral portion is generally annular over the entire circumference of the contact lens.
- the periphery is partially formed on the circumference.
- this aspect is suitably employed in soft contact lenses. Since the outer diameter of the soft contact lens is larger than that of the hard contact lens, as described above, the effect of solving the problem caused by the outer peripheral edge protruding beyond the sclera is effective. It is because it can be expected greatly.
- the peripheral portion of a contact lens is generally provided for the purpose of stably holding the shape of the contact lens or improving the stability of the position and shape under wearing conditions. It is
- An eleventh aspect of the present invention relating to a multifocal contact lens is the multifocal colored contact lens having a structure according to any one of the first to tenth aspects, wherein the outermost area of the colored region is outside. It is characterized by a diameter of 11.5 mm or less.
- the outer diameter of a common cornea in the human eye is 11.5 mm.
- the outer diameter of the contact lens is set to be smaller than that, it is effectively avoided that the outer peripheral edge of the lens protrudes from the cornea under wearing condition. Therefore, even when the outer peripheral edge of the contact lens is colored, it is possible to prevent the colored portion from protruding on the sclera and giving a sense of incongruity when viewed by others.
- the configuration in which the maximum outer diameter of the colored region is 11.5 mm or less includes the configuration in which the maximum outer diameter of the contact lens itself is set to 11.5 mm or less, as well as the outer periphery of the contact lens. It is also possible to adopt a configuration in which the maximum outer diameter of the colored transparent colored region formed on the inner periphery side is set to 11.5 mm or less by forming a colorless transparent region on the inner surface.
- the former configuration can be advantageously used for hard type contact lenses whose outer diameter dimension (DIA) is sufficiently smaller than the corneal diameter, while the latter configuration is more effective when the outer diameter dimension is closer to the corneal diameter. It can be advantageously employed for a large soft type contact lens.
- a first aspect of the present invention relating to a method for manufacturing a multifocal contact lens is a method for manufacturing a multifocal colored contact lens according to any of the above-described aspects of the present invention. Then, after masking a part of the optical region, the region other than the masked portion is colored by bringing a coloring liquid into contact with the surface of the optical region in the multifocal contact lens. It features a method for producing a mold-colored contact lens.
- a second aspect of the present invention relating to a method for manufacturing a multifocal contact lens is a method for manufacturing a multifocal colored contact lens according to any of the above-described aspects of the present invention. After masking a part of the optical region with respect to the multifocal contact lens colored, the portion subjected to the masking is brought into contact with the surface of the optical region in the multifocal contact lens. It is characterized by a method of manufacturing a multifocal colored contact lens in which the areas other than are colored with different colors by mixing colors.
- the third aspect of the present invention relating to the method for producing a multifocal contact lens is the formation of the optical region of the multifocal contact lens in producing the multifocal colored contact lens according to any of the above-described aspects of the present invention.
- the method is characterized by a multifocal colored contact lens manufacturing method in which a plurality of molding steps using colored materials of different colors are sequentially performed to perform multicolor molding.
- the molded portion is set in a molding cavity, and another part of the optical region in the molding cavity ( The other selected optical regions) are molded with materials of different colors, and the molded portions of the materials of different colors are integrated to form colored regions of a plurality of different colors, such as multicolor molding.
- a molded body provided integrally can be obtained.
- such a contact lens manufacturing method can easily form a colored optical region even when it is non-hydrophilic and difficult to be colored after molding.
- Shika also produces rod-shaped lens blanks, which can be cut out to produce a large number of contact lenses, thus mass-producing contact lenses with the same color in the same area. Place Particularly suitable.
- the multifocal contact is obtained by adopting a colored structure in combination with the set lens power region.
- a degree of freedom in adjusting the optical characteristics depending on the color can be added, and the optical characteristics can be adjusted so as to be adapted to a higher degree.
- a multifocal contact lens in a multifocal contact lens, only a selected optical region partially selected in one or more regions can be advantageously colored.
- a multifocal colored contact lens having a structure according to the invention can be easily manufactured.
- FIG. 1 is a front view showing a multifocal colored soft contact lens as a first embodiment of the present invention.
- FIG. 2 is a front view showing a multifocal colored hard contact lens as a second embodiment of the present invention.
- FIG. 3 is a front view showing a multifocal colored soft contact lens as a third embodiment of the present invention.
- FIG. 4 is a front view showing a multifocal colored soft contact lens as a fourth embodiment of the present invention.
- FIG. 5 is a front view showing a multifocal colored soft contact lens as a fifth embodiment of the present invention.
- FIG. 6 is a front view showing a multifocal colored hard contact lens as a sixth embodiment of the present invention.
- FIG. 7 is a front view showing a multifocal colored hard contact lens as a seventh embodiment of the present invention.
- FIG. 8 is a front view showing a multifocal colored hard contact lens as an eighth embodiment of the present invention.
- FIG. 1 shows a front view of a soft type contact lens 10 as a first embodiment of the present invention.
- the basic structure of the soft contact lens 10 is a conventionally known multifocal contact lens, which has a generally spherical shell shape as a whole, and is worn on the surface of the cornea in the eyeball. Is used by.
- the soft contact lens 10 of the present embodiment has a lens center axis (geometric center axis) as an optical axis, and has a rotating body shape around the lens center axis 12.
- the material of the soft contact lens 10 is not limited in any way, and conventionally known hydrous materials such as PHEMA (polyhydroxychetylmetatalylate) and PVP (polybulurpyrrolidone), acrylic rubber, Non-hydrous materials such as silicon may be used. However, considering the ease of coloring described later, a water-containing material is preferably used. By adopting such a lens material, the soft contact lens 10 is given excellent visible light transmittance as a whole! RU
- the soft contact lens 10 of the present embodiment is a concentric simultaneous vision type lens for correcting presbyopia, and in the illustrated front view of the lens, an optical region as a correction optical system 14 4 lens central axis It is formed in a large circular shape that spreads over 12.
- a peripheral portion 16 as a non-optical region is formed on the lens central axis 12 in the outer peripheral portion of the lens so as to surround the optical region 14 so as to have an annular band shape with a predetermined width.
- the edge 18 that smoothly connects the front and rear surfaces of the soft contact lens 10 is completely formed on the outer peripheral edge of the lens. Formed in an annular shape over the circumference!
- the optical region 14 has an outer diameter of 11.5 mm ⁇ or less, which is the standard value of the human cornea diameter.
- the optical region 14 is configured by optical regions having three different focal lengths on a concentric circle.
- the small circular area at the center is a near optical area 20 in which a fixed focal length (that is, lens power) is set for near vision.
- the large-diameter annular belt-like region in the outermost peripheral portion is a far optical region 22 in which a constant focal length (lens power) is set for far vision.
- the annular band-shaped region in the radially intermediate portion is a transition region 24, and in this embodiment, gradually changes in the radial direction from the lens power of the near optical region 20 to the lens power of the far optical region 22.
- the focal length (lens power) is set.
- a fixed focal length (lens power) intermediate between the near optical region 20 and the far optical region 22 may be set!
- the near optical region 20 and the far optical region 22 are different selection optical regions, and are colored and transparent colored regions having different colors.
- the transition region 24 formed only by the peripheral portion 16 and the edge portion 18 is also a non-colored region and is substantially colorless and transparent.
- substantially colorless and transparent means that it has been conventionally applied to improve the visibility of the external force of a single contact lens that is not completely colorless and facilitate handling! It is said to be a light and green ground color.
- the near optical region 20 is a blue colored transparent colored region.
- the distance optical region 22 is a yellow colored transparent colored region. Yellow and blue may be any color as long as humans can objectively recognize each color, but more preferably, yellow is the peak of the wavelength component ( ⁇ max) is present in the region of force 530-586 nm, and blue is recognized as being present in the region of max force 380-498 nm.
- the near optical region 20 and the far optical region 22 both have a visible light transmittance of 80% as an average value of the entire region. More than 70% is more preferable.
- the near-field optical region 20 and In order to obtain the coloring effect advantageously, the distance optical region 22 is desired to have a visible light transmittance of 98% or less, more preferably 93% or less.
- the near optical region 20 and the far optical region 22 are both colored with a substantially constant density throughout the entire region, Even if it is selected, the visible light transmittance as described above can be satisfied.
- the pupil diameter is larger than the inner diameter dimension of the distance optical region 22 and smaller than the outer diameter dimension in the worn state. Is set to Therefore, the light transmitted through both the near-field optical region 20 and the far-field optical region 22 is simultaneously viewed, and by selectively recognizing a clearer image unconsciously, You will be able to recognize far-field images.
- each of the near optical region 20 and the far optical region 22 is attached separately. It is possible to obtain the effect by the colored. Specifically, as will be apparent from the examples described later, the contrast of the visualized image is improved as a yellow coloring effect in the near optical region 20 and as a blue coloring effect in the far optical region 22, respectively. As a result, clear visibility is realized.
- FIG. 2 shows a front view of a hard-type contact lens 26 as a second embodiment of the present invention.
- the basic structure of the hard contact lens 26 is a conventionally known multifocal type contact lens, and the portion having the same structure as the soft type contact lens 10 of the first embodiment is shown in the drawing.
- the same reference numerals as those in the first embodiment are attached, and detailed description thereof is omitted.
- the material of the hard contact lens 26 is not limited in any way.
- PMMA polymethylmetatalylate
- RGP gas permeability using a fluorine compound or the like is also used. It may be a thing.
- the hard contact lens 26 of the present embodiment allows the movement on the cornea to be greatly allowed as compared with the force soft contact lens which is a concentric simultaneous vision type presbyopia correction lens.
- the outer diameter (DIA) is sufficiently smaller than the soft contact lens. ing.
- the substantially entire lens from the lens central axis 12 to the edge 18 of the outer peripheral edge is an optical region 14, and no peripheral portion such as a soft contact lens is provided.
- the hard contact lens 26 of the present embodiment has the soft contact in the first embodiment so that the coding force applied to the lens front view shown in the figure is also increased. Contrary to the lens 26, a distance optical region 22 is provided in the central portion of the optical region 14, and a near optical region 20 is provided in the outer peripheral portion of the optical region 14.
- the near-use optical region 20 is a blue colored transparent colored region.
- the distance optical region 22 is a yellow colored transparent colored region.
- the definition of blue and yellow and the preferable range of the color density are the same as those in the first embodiment, and thus the description thereof is omitted here.
- the pupil diameter is larger than the inner diameter dimension of the near-field optical region 20 and smaller than the outer diameter dimension in the mounted state.
- the pupil diameter is larger than the inner diameter dimension of the near-field optical region 20 and smaller than the outer diameter dimension in the mounted state.
- the distance optical region 22 and the near optical region 20 The effect by coloring attached to each can be acquired.
- the contact lenses 10 and 26 according to the first and second embodiments as described above can be advantageously manufactured as follows, for example.
- a contact lens completed in shape having a predetermined lens power specifically, a mold forming method, a spin cast method, a cutting (cutting) method, or the like. Produced by etc.
- a coloring film that can be infiltrated and held by a dye is prepared separately from the powerful contact lens. Then, this coloring film is cut out to the surface shape of the target colored region in the contact lens to obtain a coloring screen.
- the near-field optical region is used as a coloring film. It is necessary to prepare two types, a near-field coloring film having a shape corresponding to the frontal shape of the area 20 and a far-area coloring film having a shape corresponding to the frontal shape of the distance optical area 22.
- the prepared coloring screen is superimposed on the lens surface (front surface and Z or back surface) of the contact lens in a close contact state.
- the coloring screen is impregnated with a dye for the purpose of coloring the lens before or after the contact with the contact lens.
- the contact lens is brought into contact with the dye held by the area force coloring screen for the purpose of coloring the surface thereof.
- the screening force for coloring The region of the contact lens brought into contact with the coloring screen can be colored by the diffusion and transfer of the dye into the contact lens.
- a plurality of coloring screens prepared in a shape corresponding to each coloring area are used, and these are colored to the corresponding colors of the contact lens.
- the coloring process can be performed by sequentially bringing the region into close contact with each other.
- a plurality of coloring screens can be simultaneously subjected to coloring treatment by bringing them into close contact with the corresponding coloring regions of the contact lens.
- the entire contact lens manufactured in advance is first immersed in a staining solution to color the entire lens. Thereafter, using a coloring screen having a shape corresponding to a specific area that has been colored to another color, only the specific area that is strong is over-dyed in the same manner as the above-described coloring method.
- the distance optical region 22 formed in the central portion of the lens is colored yellow and formed in the outer peripheral portion.
- the case where the near optical region 20 thus formed is colored blue including the transition region 24 and the edge portion 18 will be described below.
- an intermediate molding rod having a circular cross-sectional shape with an outer diameter corresponding to the outer diameter dimension of the distance optical region 22 is formed by polymerization molding using a lens molding material mixed with a yellow colorant. To do.
- a rod In this way, an intermediate molding rod consisting of a yellow lens molding material that forms the distance optical region 22 is embedded on the central axis, and a blue lens component that forms the near optical region 20 is formed around it.
- the final molded rod is formed in a two-color molding manner in a radial double-layered structure surrounded by the shape material.
- the desired hard contact lens 26 can be obtained by cutting out the final molded rod with an appropriate thickness and cutting the obtained disk-shaped lens base plate.
- the center optical distance 22 in the center is colored yellow by an intermediate molding rod, and the near optical area 20 in the outer peripheral portion thereof is in the final optical rod 20 of the final molding rod. Blue coloring is given to the outer peripheral part.
- the transition region 24 is colorless and transparent.
- the transition region 24 may also be colored.
- the visible light in the transition region 24 It is also conceivable to improve the appearance by suppressing the transmittance of the material by coloring.
- both the near optical region 20 and the far optical region 22 are colored in each color. However, any one of them may be used depending on the circumstances and requirements of each wearer. Only one optical region may be a colored region, and the other region may be colorless and transparent.
- the near optical region 20 and the far optical region 22 may be partially colored, or may be partially colored by changing the density.
- FIGS. 3 to 5 show other aspects of the selected optical region that are preferably employed in the soft contact lens as in the first embodiment.
- the soft contact lens 30 shown in FIG. 3 is preferably used as a simultaneous viewing type similarly to the soft contact lens 10 of the first embodiment, and a plurality of optical regions have a lens center. Although it is formed in a circular shape or an annular band shape on the same axis as the shaft 12, the number of divisions of the regions and the arrangement manner are different. That is, in the soft contact lens 30 of the present embodiment, the distance optical regions 22 and 22 are formed at the center and the outermost peripheral portion of the optical region 14. Further, between the radial directions of the two distance optical regions 22 and 22, the intermediate optical region 32 and the near optical region 20 are each formed in an annular band shape on the concentric axis.
- a fixed lens power (focal length) suitable for far vision and near vision is set in each of the far optical regions 22 and 22 and the near optical region 20.
- the intermediate optical area 32 has a lens power suitable for visual recognition at intermediate distances.
- An appropriate fixed focal length in the middle of the approval is set.
- the intermediate optical region 32 as well as the far optical regions 22, 22 and the near optical region 20 can be colored appropriately.
- the near optical region 20 and the far optical region 22 are arranged concentrically with respect to the lens central axis 12, and a plurality of each is formed.
- the distance optical region 22 is formed in three regions including the central axis and the outermost periphery, and the near optical region 20 has any inner and outer periphery in the distance optical region 22. It is formed in two annular belt-like regions with a gap between them.
- At least one of the plurality of near optical regions 20 and the far optical regions 22 can be a colored region of an appropriate color. .
- the central axis 38 of the optical region 14 is moved from the lens central axis 12 to the nose by a predetermined amount in consideration of the position of the visual axis in the wearing state. It is biased.
- the lens itself is positioned in the circumferential direction under the wearing state by prism ballast or the like. A structure that can be used is adopted.
- the near-field optical system is coaxial with respect to the central axis 38 of the optical region 14 that is decentered with respect to the lens central axis 12, as in the first embodiment.
- a region 20, a transition region 24, and a distance optical region 22 are formed.
- the biasing structure itself with respect to the lens central axis 12 in the optical region 14 is known in, for example, Patent Document 1 and the like, the description of the setting and the effect thereof is omitted here.
- FIGS. 6-8 show other modes of the selected optical region that are preferably employed in the hard contact lens as in the second embodiment.
- the node contact lens 40 shown in FIG. 6 is located in the central portion excluding the outer peripheral edge portion, and the circular optical region 14 is formed coaxially with the lens central axis 12.
- this optical region 14 there is substantially no portion extending in the radial direction at a fixed focal length (lens power) .
- the optical region 14 has a predetermined polynomial with respect to the radial separation distance from the lens central axis 12. Accordingly, as shown, the lens power is gradually changed in the radial direction.
- the change in the lens power value (the value on the minus side and the plus side of the added power) is represented by black and white shading.
- an area capable of exhibiting an effective optical action for near vision for example, a predetermined lens power located in the outer peripheral portion of the optical area 14.
- a region for example, a region having a predetermined lens power that is located at the center of the optical region 14 that can exhibit an effective optical action when viewed from a distance. Therefore, by setting the appropriate focal length regions to colored transparent regions of exceptionally appropriate colors in the same manner as in the second embodiment, the same effects as in the second embodiment can be obtained. Can be obtained.
- the region located in the intermediate portion in the radial direction of the optical region is considered in the same manner as the transition region 24 in the second embodiment, and is colorless and transparent. It is also possible to make it transparent with appropriate color.
- the hard contact lens 42 shown in FIG. 7 is substantially the entire optical region 14, and the upper half region and the lower half region in the worn state are mutually separated. Each of these is a selected optical region, which is given a substantially constant lens power (focal length).
- the hard contact lens 42 of the present embodiment is a so-called alternate vision type lens, and the upper half region is the distance optical region 22, while the lower half region is the lower half region.
- Near-field optical region 20 the lens itself employs a structure that can be positioned in the circumferential direction under wearing conditions by a prism ballast or the like.
- the near optical region 20 and the far optical region 22 are worn by using the fact that the visual axis is generally directed upward when looking at the distance while the visual axis is generally directed downward when looking at the near. It is possible for the person to visually recognize it by using it alternatively to some extent.
- the near optical region 2 By setting 0 as a blue colored transparent colored region and the distance optical region 22 as a yellow colored transparent colored region, the same effect as in the second embodiment can be obtained.
- the hard contact lens 44 shown in FIG. 8 is also a so-called alternate vision type lens.
- a distance optical region 22 is formed with a small circular shape in the center portion, and a circle having a predetermined width in the radial direction is located at a predetermined distance from the distance optical region 22 to the outer peripheral side.
- the near-use optical region 20 is formed with an annular shape.
- a peripheral portion 16 having a predetermined width and spreading in an annular band shape is formed on the outermost peripheral portion of the lens.
- the annular zone-shaped intermediate region 46 between the distance optical region 22 and the near optical region 20 does not give a specific lens power for viewing far or near, like the peripheral portion 16.
- the pupil diameter is relatively small because it is generally outdoors and bright with sunlight.
- the region 22 acts more dominantly on the incident light on the eye than the peripheral optical region 20 in the outer peripheral portion.
- the distance optical region 22 is selectively used.
- the pupil diameter is relatively large, and the outer peripheral part is smaller than the small distance optical region 22 in the center of the lens.
- the larger near-field optical region 20 has a dominant effect on the light incident on the eye. As a result, the near optical region 20 is selectively used.
- FIGS. 3-5 can also be used for hard contact lenses
- FIGS. 6-8 can also be used for soft contact lenses.
- the soft contact layer having the structure according to the first embodiment shown in FIG.
- hard contact lenses having a structure according to the second embodiment shown in FIG.
- a hydrous contact lens (10) made by PHEMA was used as the soft contact lens.
- the outer diameter dimension of the near-field optical area (20) formed in the central part of the optical area (14) is 1.4 mm, and the inner diameter dimension of the distance optical area (22) formed in the outer peripheral area is 2.4 mm, the outer diameter dimension. 8. Omm.
- the transition region (24) located between the near optical region and the far optical region is changed from the constant lens power set in the near optical region to the constant lens power set in the far optical region. Until now, the lens power gradually changes in the radial direction.
- the soft contact lens employed had a near optical region and a Z or far optical region as a selection optical region, and a colored optical region of an appropriate color.
- the colored optical region was colored using a coloring screen after a soft contact lens having a desired optical characteristic was manufactured in advance.
- the produced soft contact lens was first immersed in distilled water to swell to a saturated state, and then taken out.
- a near-field coloring screen with a thin disc shape corresponding to the front shape of the target near-field optical area and a far-colored coloring screen with a thin annular zone shape corresponding to the front shape of the distance optical area are prepared. did. Nylon films were used for these near and far-use coloring screens.
- the back surface of the near-coloring screen was brought into close contact with the front surface of the near-field optical region of the soft contact lens and pressed by pressing with a sponge from above. Thereafter, a blue dyeing solution prepared at an appropriate concentration was dropped onto the surface of the near-coloring screen and held on the near-coloring screen. Then, the staining solution is kept in contact with the near optical region of the soft contact lens through the near coloring screen for 10 minutes, so that the staining solution is diffused and transferred into the soft contact lens. The optical region for use was colored blue.
- the near-coloring screen was peeled from the soft contact lens and washed with distilled water to replace the swelling water in the lens with distilled water.
- the back surface of the far-coloring screen is placed on the far side of the soft contact lens.
- a yellow dyeing solution prepared at an appropriate concentration was dropped and held on the front coloring screen, and pressed against the front surface of the optical region for use. In this state, by allowing to stand for 30 minutes, the staining solution was diffused and transferred to the far optical region of the soft contact lens, and the far optical region was colored yellow.
- the distant coloring screen was peeled off, and the soft contact lens was washed and replaced with distilled water to obtain the desired colored soft contact lens.
- an RGP lens was adopted as the hard contact lens (26).
- the outer diameter of the distance optical region (22) formed at the center of the optical region (14) was 2. Omm
- the inner diameter of the near optical region (20) formed at the outer periphery was 6. Omm.
- a constant lens power set in the far optical region is reached until a constant lens power set in the near optical region is reached.
- the lens power gradually changes in the radial direction.
- the near optical region and the Z or far optical region are selected optical regions and colored optical regions of appropriate colors.
- the colored optical region was colored using a coloring screen after a hard contact lens having the desired optical characteristics was manufactured in advance.
- the specific method of coloring was using near and far coloring screens, and was based on the description of the soft contact lens examples described above.
- the evaluation was performed by measuring the contrast sensitivity of the contact lens wearing eye using CSV1000 (trade name) manufactured by Vector Vision. Note that the contrast sensitivity is measured by the brightness of the stripe pattern (contrast) and its interval (spatial frequency): This is an inspection method that measures contrast sensitivity for each spatial frequency while changing cycle Zdegree (cZdeg). With the CSV1000 used in this experiment, it is possible to measure the spatial frequency that also has six steps of sinusoidal lattice force of 1.5, 3.0, 6.0, 12.0, 18.0, 32. OcZdeg. A lattice is a light and dark striped pattern, and a sine wave lattice is a target whose light and darkness (luminance) of a striped pattern changes sinusoidally.
- the contrast (stripe pattern light and dark) of each spatial frequency is sequentially applied to the subject wearing the contact lens that is the measurement target. This was done by presenting a low target and having the subject answer the orientation of the seven targets. In particular, this time, measurement was started from a target with high contrast (a clear contrast), and inspections were sequentially conducted for targets with low contrast. The near and far measurement distances were measured under the best near and near vision correction.
- the results are shown in the following "Table 1" and "Table 2".
- the experimental evaluation results shown in the table are, as a comparative example, a soft contact lens in which the entire lens is uncolored, and the contrast at the time of wearing is evaluated in accordance with the above-described method in the above six stages.
- the results of comparing the contrast evaluation results for each colored contact lens were expressed as four types of symbols X, ⁇ , ⁇ , and ⁇ , with reference values as reference values.
- X indicates that the contrast is hardly improved compared to the evaluation result (reference value) of the comparative example
- ⁇ indicates that the contrast is improved by one step compared to the comparative example
- ⁇ indicates that the comparison This indicates that the contrast has improved by two levels compared to the example, and ⁇ indicates that the contrast has improved by three levels or more compared to the comparative example.
- the dye concentration is a value representing the mass of the dye per unit volume of solvent (weightZvolume) as a percentage, and represents the coloring concentration of the lens as an alternative. Adopted.
- Example No. 17 and No. 18 are the same contact lenses as those of Example No. 4 and No. 5 shown in Table 1. As comparative examples, The same contact lens as shown in Table 1 was used.
- Examples No. 1 to No. 30 shown in Tables 1 and 2 are all soft contact lenses.
- the contact lens of the comparative example was also a soft contact lens.
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Abstract
Description
Claims
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010034497A1 (de) * | 2010-08-16 | 2012-02-16 | Wöhlk-Contact-Linsen GmbH | Hydrogel-Multifokalkontaktlinse |
JP2015148673A (ja) * | 2014-02-05 | 2015-08-20 | 株式会社ニコン・エシロール | 眼鏡用レンズ |
JP7458355B2 (ja) | 2021-09-16 | 2024-03-29 | 株式会社東芝 | 光学装置、及び、推定方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59107322A (ja) * | 1982-12-13 | 1984-06-21 | Seiko Epson Corp | 累進多焦点レンズ |
JPH06175084A (ja) * | 1992-12-01 | 1994-06-24 | Nikon Corp | 累進焦点レンズ又はレンズ |
JP2001517324A (ja) * | 1997-03-31 | 2001-10-02 | パラガン、ヴィジァン、サイエンセズ、インク | 光濾波性コンタクトレンズ |
JP3286977B2 (ja) * | 1992-01-06 | 2002-05-27 | セイコーエプソン株式会社 | コンタクトレンズ |
-
2004
- 2004-08-19 WO PCT/JP2004/011903 patent/WO2006018879A1/ja active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59107322A (ja) * | 1982-12-13 | 1984-06-21 | Seiko Epson Corp | 累進多焦点レンズ |
JP3286977B2 (ja) * | 1992-01-06 | 2002-05-27 | セイコーエプソン株式会社 | コンタクトレンズ |
JPH06175084A (ja) * | 1992-12-01 | 1994-06-24 | Nikon Corp | 累進焦点レンズ又はレンズ |
JP2001517324A (ja) * | 1997-03-31 | 2001-10-02 | パラガン、ヴィジァン、サイエンセズ、インク | 光濾波性コンタクトレンズ |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010034497A1 (de) * | 2010-08-16 | 2012-02-16 | Wöhlk-Contact-Linsen GmbH | Hydrogel-Multifokalkontaktlinse |
DE102010034497B4 (de) | 2010-08-16 | 2019-06-27 | Wöhlk-Contact-Linsen GmbH | Hydrogel-Multifokalkontaktlinse |
JP2015148673A (ja) * | 2014-02-05 | 2015-08-20 | 株式会社ニコン・エシロール | 眼鏡用レンズ |
JP7458355B2 (ja) | 2021-09-16 | 2024-03-29 | 株式会社東芝 | 光学装置、及び、推定方法 |
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