CN112361974A - Method for measuring parameters of contact lenses - Google Patents
Method for measuring parameters of contact lenses Download PDFInfo
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- CN112361974A CN112361974A CN202011473372.8A CN202011473372A CN112361974A CN 112361974 A CN112361974 A CN 112361974A CN 202011473372 A CN202011473372 A CN 202011473372A CN 112361974 A CN112361974 A CN 112361974A
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- 238000005259 measurement Methods 0.000 claims abstract description 52
- 239000012778 molding material Substances 0.000 claims abstract description 50
- 238000012876 topography Methods 0.000 claims abstract description 26
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- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 6
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- 229910052602 gypsum Inorganic materials 0.000 claims description 3
- 239000010440 gypsum Substances 0.000 claims description 3
- 229920000570 polyether Polymers 0.000 claims description 3
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- 150000008117 polysulfides Polymers 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 3
- 229920002379 silicone rubber Polymers 0.000 claims description 3
- 239000004945 silicone rubber Substances 0.000 claims description 3
- 239000011787 zinc oxide Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 description 33
- 230000003287 optical effect Effects 0.000 description 17
- 238000010586 diagram Methods 0.000 description 11
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- 238000000691 measurement method Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000012014 optical coherence tomography Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/08—Measuring arrangements characterised by the use of optical techniques for measuring diameters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/2433—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures for measuring outlines by shadow casting
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Eyeglasses (AREA)
Abstract
The present disclosure provides a method of measuring parameters of a contact lens, comprising preparing a cured molding material and molding and curing the contact lens using the cured molding material, forming a cured molded lens model containing the contour of the inner lens surface of the contact lens; separating a lens mold from the contact lens, the lens mold having an outer surface matching the inner lens surface, the outer surface being formed as a smooth surface; and measuring the surface topography of the outer surface of the lens model by using the corneal topographer so as to obtain the parameters of the contact lens through the surface topography, wherein in the process of measuring the lens model, the lens model is placed in the projection range of the corneal topographer, the outer surface of the lens model is detected by the corneal topographer, a topography image representing the surface topography of the outer surface of the lens model is generated, and the parameters of the contact lens are obtained according to the topography image. According to the present disclosure, a method of measuring parameters of a contact lens capable of improving measurement accuracy can be provided.
Description
Technical Field
The present disclosure relates to a method of measuring a parameter of a contact lens.
Background
A contact lens is a lens that directly contacts the surface of the eye, such as a corneal lens, a scleral lens, or the like. Parameters such as arc zone angle and diameter of the contact lens directly influence the wearing effect of the contact lens and the vision safety of a wearer, so that the measurement of the parameters of the contact lens is important for evaluating the quality of a contact lens product.
At present, the parameters of the contact lens are generally measured by direct projection, such as the measurement method specified in the standard ISO18369-3-2017, and the parameters of each arc zone of the contact lens are generally measured by using an Optical Coherence Tomography (OCT).
However, the optical coherence tomography scanner is easily interfered by light, sound and other factors, so that the accuracy of the measurement result is low. In addition, the self-structure of the contact lens may affect the accuracy of the measurement of the optical coherence tomography, for example, the depth of vector and the thickness of the edge of the scleral lens may be larger than those of the common keratoscope, which easily causes the measured data to have larger error, exceeding the tolerance range specified by the standard.
Disclosure of Invention
In view of the above-described conventional circumstances, an object of the present disclosure is to provide a method for measuring parameters of a contact lens, which can improve measurement accuracy.
To this end, the present disclosure provides a method of measuring a parameter of a contact lens, comprising: preparing a curing molding material, molding and curing the contact lens by using the curing molding material, and forming a curing molded lens model containing the contour of the inner lens surface of the contact lens; separating the lens mold from the contact lens, the lens mold having an outer surface that matches the inner lens surface, the outer surface being formed as a smooth surface; and measuring the surface topography of the outer surface of the lens model by using a corneal topographer so as to obtain the parameters of the contact lens through the surface topography, wherein in the process of measuring the lens model, the lens model is placed in the projection range of the corneal topographer, the outer surface of the lens model is detected by the corneal topographer, a topography image representing the surface topography of the outer surface of the lens model is generated, and the parameters of the contact lens are obtained according to the topography image. In the present disclosure, a lens model corresponding to a contact lens is obtained using a cured molding material and the lens model is inspected using a corneal topographer, in which case accurate parameters of the lens model are obtained by measuring the cured lens model, so that accurate parameters of the contact lens can be obtained.
In addition, in the method according to the present disclosure, optionally, in molding the contact lens, the cured molding material is filled in an inner mirror surface of the contact lens having a concave shape and covers an edge of the contact lens to form the lens mold. Thus, a lens model matching the inner lens surface of the contact can be obtained.
Further, in the method according to the present disclosure, optionally, in the measuring of the lens model, the lens model is fixed and arranged within a projection range of the corneal topographer using an auxiliary plate. This can facilitate measurement using the corneal topographer.
In addition, in the method according to the present disclosure, the lens model optionally further has a bottom portion which is fixed to the auxiliary plate by adhesion and faces an outer surface of the lens model toward the corneal topographer. Thereby, the inspection of the outer surface of the lens model can be facilitated.
In addition, in the method according to the present disclosure, optionally, the solidified molding material is injected into the inner surface of the contact lens in a spiral form from the center toward the edge when the solidified molding material is filled in the contact lens. This can reduce the generation of bubbles during the filling of the contact lens.
In addition, in the method related to the present disclosure, optionally, the method includes cutting the lens model to form at least one model to be measured, measuring the at least one model to be measured by using a measuring instrument, and obtaining parameters of the lens model according to a measurement result of the at least one model to be measured, so as to obtain parameters of the contact lens corresponding to the lens model. Thereby, the parameters of the contact lens can be further measured.
Additionally, in methods of the present disclosure, optionally, prior to separating the lens model from the contact lens, the lens model is marked to form a mark related to the sagittal depth of the contact lens. This enables formation of a marked lens model.
In addition, in the method according to the present disclosure, optionally, during the measurement of the model to be measured, a cut surface of the model to be measured is placed on a stage of the measuring instrument to perform the measurement. Thereby, it is possible to facilitate measurement of parameters of the surface of the model to be measured.
In addition, in the method according to the present disclosure, optionally, the cured molding material is an impression material, and the impression material is a silicone rubber impression material, a polysulfide rubber impression material, a polyether rubber impression material, an agar gel impression material, an impression gypsum, or a zinc oxide clove oil paste. This enables the contact lens to be molded.
Additionally, in the methods to which the present disclosure relates, optionally, the contact lens is a corneal contact lens, a keratoplasty lens, or a scleral contact lens having a plurality of zones.
According to the present disclosure, a method of measuring parameters of a contact lens capable of improving measurement accuracy can be provided.
Drawings
Embodiments of the present disclosure will now be explained in further detail, by way of example only, with reference to the accompanying drawings, in which:
fig. 1 is a schematic configuration diagram showing one example of a contact lens according to an example of the present disclosure.
Fig. 2 is a flow chart illustrating a method of measuring parameters of a contact lens in accordance with an example of the present disclosure.
Fig. 3 is a scene schematic diagram illustrating a lens model curing profile according to an example of the present disclosure.
Fig. 4 is a schematic structural diagram showing a lens model according to an example of the present disclosure.
Fig. 5 is a scene schematic diagram illustrating lens model measurements to which examples of the present disclosure relate.
Fig. 6 is a schematic view showing that a lens model according to an example of the present disclosure is fixed to an auxiliary plate.
Fig. 7 is a schematic diagram showing a structure of a model under test according to an example of the present disclosure.
Fig. 8 is a schematic diagram illustrating a scenario of a model under test measurement according to an example of the present disclosure.
Fig. 9 is an enlarged schematic view showing the model under test in fig. 8.
Detailed Description
All references cited in this disclosure are incorporated by reference in their entirety as if fully set forth. Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the following description, the same components are denoted by the same reference numerals, and redundant description thereof is omitted. The drawings are schematic and the ratio of the dimensions of the components and the shapes of the components may be different from the actual ones.
In the present disclosure, the method of measuring the parameter of the contact lens S may be simply referred to as a measurement method. Additionally, the method of measuring parameters of a contact lens S to which the present disclosure relates may include preparing a lens model 2 and measuring parameters of the lens model 2 to obtain parameters of the contact lens S.
In some examples, the contact lens S may have an inner mirror surface S1And an outer mirror surface S2(see FIG. 3). Wherein the inner surface S of the contact lens S1Can be concave and has an external mirror surface S2May be convex. In some examples, the measurement methods of the present disclosure can measure the inner surface S of the contact lens S1The parameter (c) of (c).
In some examples, the contact lens S may have multiple arc zones. In some examples, the inner surface S of the contact lens S1There may be multiple arc zones. In addition, the measurement method according to the present embodiment can measure one or more zones of the contact lens S.
In some examples, the parameters of the contact lens S may include the angles and diameters of the multiple arc zones. That is, the parameters of the contact lens S may include the inner mirror surface S1Angle and diameter of the plurality of arc zones. In addition. The parameters of the contact lens S may also include the radian of the base arc, the eccentricity (e-value) of the base arc, etc.
In the present embodiment, the diameter of each arc region in the contact lens S generally refers to the diameter of the outermost edge of each arc region, wherein the outermost edge may refer to the edge of the arc region farthest from the center of the contact lens S. In the present embodiment, the angle of each arc region in the contact lens S generally refers to the angle of the included angle formed by each arc region and the diameter of each arc region (or the diameter of the contact lens S).
In some examples, the contact lens S may be a corneal contact lens, a keratoplasty lens, or a scleral contact lens 3. In some examples, the contact lens S may be a contact lens with multiple arcs, a keratoplasty lens, or a scleral contact lens 3. Thereby, parameters of a plurality of arc zones of a plurality of contact lenses can be measured.
Fig. 1 is a schematic diagram showing one example of a contact lens S to which an example of the present disclosure relates.
In some examples, as shown in fig. 1, contact lens S may be a scleral contact lens 3. in addition, scleral contact lens 3 may have an inner lens surface 31 and an outer lens surface 32.
In some examples, as shown in fig. 1, contact lens S may be a scleral contact lens 3 having an optical region 3a, a mid-peripheral filling region 3b, and a limbal filling region 3 c. By the measurement method according to the present embodiment, parameters of the inner surfaces of the optical zone 3a, the intermediate peripheral filling zone 3b, and the limbal filling zone 3c of the scleral contact lens can be measured.
In some examples, as shown in fig. 1, scleral contact lens 3 may have an optical region 3a, a mid-peripheral filling region 3b, and a limbal filling region 3 c. The scleral contact lens 3 may have three arcs of an optic zone 3a, a mid-peripheral filling zone 3b and a limbal filling zone 3 c.
In some examples, as shown in fig. 1, optical zone 3a may surround mid-peripheral filling zone 3b, and limbal filling zone 3c may surround mid-peripheral filling zone 3 b.
In some examples, as shown in fig. 1, the thickness of the intermediate filling zone 3b may be greater than the thickness of the optical zone 3 a. In some examples, the thickness of the limbal filling zone 3c may be greater than the thickness of the optical zone 3 a. In some examples, the scleral contact lens 3 may increase in thickness gradually from the optical zone 3a to the limbal filling zone 3 c.
In some examples, the thickness of the limbal filling area 3c may be 0.05mm to 0.1 mm. For example, the thickness of the limbal filling area 3c may be 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm or 0.1 mm.
In some examples, as shown in fig. 1, scleral contact lens 3 may also include a positioning region 3 d. In some examples, the positioning zone 3d may surround the limbal filling zone 3 c. In addition, the thickness of the positioning region 3d may gradually decrease from the boundary with the limbal filling region 3c to the edge of the scleral contact lens 3
Hereinafter, a method of measuring parameters of the contact lens S will be described in detail with reference to the accompanying drawings. Fig. 2 is a flowchart illustrating a method of measuring a parameter of a contact lens S according to an example of the present disclosure.
In some examples, a method of measuring a parameter of a contact lens S may include preparing a lens model 2; and measures parameters of the lens model 2 to obtain parameters of the contact lens S.
In some examples, a method of measuring parameters of a contact lens S may include preparing a cured molding material 1 and molding the contact lens S using the cured molding material 1 to form a lens model 2.
In the present embodiment, as shown in fig. 2, the method of measuring the parameters of the contact lens S may include preparing the curing molding material 1 and using the curing moldingThe molding material 1 molds and cures the contact lens S to form an inner lens surface S including the contact lens S1And the molded lens model 2 is cured (step S10).
In some examples, in step S10, the contact lens S may be placed on a flat surface. In some examples, in step S10, the contact lens S may be shaped with the inner mirror surface S during shaping of the contact lens S1Placed in an upward manner. In addition, the lens mold 2 of the contact lens S may be molded at room temperature of 15 to 25 ℃.
In some examples, in step S10, the outer mirror surface S of the contact lens S1Can be sucked by a contact lens suction rod and then the lens model 2 of the contact lens S is molded.
In some examples, step S10 may include preparing to cure the molding material 1, as described above. In addition, in some examples, the cured molding material 1 may be an impression material. This enables molding of the contact lens S, which is advantageous for rapid formation of the lens mold 2 having a stable shape.
In some examples, the impression material may include a matrix and a catalyst. In addition, in some examples, in step S10, an impression material may be obtained by mixing a substrate and a catalyst. That is, the cured molding material 1 can be obtained by mixing the matrix and the catalyst.
In some examples, in step S10, the cure time may be adjusted by altering the ratio of matrix and catalyst. Additionally, in some examples, the curing time may be 1 to 3min in step S10. For example, the curing time may be 1min, 1.2min, 1.5min, 1.8min, 2min, 2.5min, or 3 min. In addition, the hardness of the lens model 2 can be adjusted by adjusting the ratio of the substrate and the catalyst. For example, the ratio of substrate to catalyst may be 1: 1. Thus, the lens model 2 having appropriate hardness can be obtained.
In some examples, the impression material may be a silicone rubber impression material, a polysulfide rubber impression material, a polyether rubber impression material, an agar gel impression material, an impression gypsum, or a zinc oxide clove oil paste.
In some examples, mayTo inject the solidified molding material 1 into the inner surface S of the contact lens S1To mold the contact lens S into the lens mold 2.
In some examples, in step S10, when filling the solidified molding material 1 in the contact lens S, the solidified molding material 1 may be injected in a spiral form from the center toward the edge into the inner surface S of the contact lens S1. This can reduce the generation of bubbles during filling of the contact lens S. That is, the implantation may be started from the middle of the contact lens S and then the coils may be implanted outward.
In some examples, in step S10, the injection may be started from the middle of the contact lens S, and then the solidified molding material 1 is injected around and out while the contact lens S is rotated. In addition, the direction of the turns of the solidified molding material 1 may be different from (e.g., opposite to) the direction in which the contact lens S is rotated.
In some examples, the solidified molding material 1 may be injected at a uniform speed while filling the solidified molding material 1 in the contact lens S. This can contribute to reduction of generation of bubbles.
In some examples, in step S10, the injection of the solidified molding material 1 may be performed toward the center of the contact lens S. Thereby, the fixation of the contact lens S during the injection of the cured molding material 1 can be facilitated. In addition, the contact lens S may be fixed by a contact lens suction rod during the injection of the curing molding material 1.
Fig. 3 is a scene schematic diagram illustrating curing molding of the lens model 2 according to an example of the present disclosure.
Specifically, in the process of molding the contact lens S, the solidified molding material 1 may be filled in the concave inner surface S of the contact lens S1And covers the edge of the contact lens S to form the lens mold 2. Thereby, an inner mirror surface S in contact with the inner mirror surface S can be obtained1Matched lens model 2. In addition, in some examples, as shown in fig. 3, the cured molding material 1 may overflow the edges of the contact lens S.
In some examples, in step S10, the solidified molding material 1 fills the inner surface S of the contact lens S1Thereafter, the lens may be inverted on a smooth watchThe surface (e.g. of glass, metal or plastic) is cured, i.e. the contact lens S filled with the cured molding material 1 can have an inner surface S1Placed on a smooth surface in a face down manner (see fig. 3).
In some examples, step S10 may include removing excess cured molding material 1 to form lens mold 2. In other examples, excess cured molding material 1 may be removed along the edges of the contact lens S. In addition, excess cured molding material 1 may be removed with a blade. For example, the excess cured molding material 1 may be cut off with a blade.
In some examples, in step S10, the contact lens S filled with the cured molding material 1 may be fixed by hand or other tool and excess cured molding material 1 may be removed. In other examples, the inner surface S of the contact lens S is contacted during removal of excess cured molding material 11May face downward. In addition, in the process of removing the excess cured molding material 1, the contact lens S filled with the cured molding material 1 may be perpendicular to the plane of placement.
Fig. 4 is a schematic structural diagram showing a lens model 2 according to an example of the present disclosure.
In some examples, in step S10, as shown in fig. 4, lens model 2 may have an outer surface 21 and a bottom 22. In addition, the outer surface 21 may be formed as a smooth surface. Further, the bottom 22 of the lens model 2 may intersect the outer surface 21 (see fig. 4).
In some examples, the outer surface 21 of the lens model 2 may contact the inner surface S of the contact lens S1And (4) matching. That is, the lens model 2 may have a matching inner mirror surface S1And an outer surface 21. In this case, the surface topography of the outer surface 21 is obtained by measuring the outer surface 21 of the lens model 2, so that the inner surface S of the contact lens S can be obtained from the surface topography1Such as geometric parameters.
In some examples, the outer surface 21 of the lens model 2 may be formed as a contour of the lens model 1. In some examples, the lens model 2 of the contact lens S may have an inner lens surface S with the contact lens S1A matching profile. In other words, lens model 2 can inscribe the inner lens surface S of contact lens S1The profile of (a). In this case, by measuring the contour of the lens model 1, the inner lens surface S of the contact lens S can be obtained1The parameter (c) of (c).
In some examples, as described above, the lens model 2 may have an inner lens surface S in contact with the contact lens S1Arc (i.e. inner mirror surface S)1Profile) of the same profile. In particular, the lens mold 2 can fill the inner surface S of the contact lens S with the curable molding material 11And cured to form the lens model 2 so that the inner lens surface S of the contact lens S can be formed1Having an outer surface 21 of the same contour. In other words, the lens model 2 may have an inner mirror surface S in contact with the contact lens S1Of the outer surface 21 (see fig. 4). In this case, the inner lens surface S of the contact lens S can be obtained by measuring the outer surface 21 of the lens model 21The parameter (c) of (c). That is, the parameters of the outer surface 21 of the lens model 2 can be correlated with the inner surface S of the contact lens S1The parameters of (a) are consistent. In addition, the parameters of the lens model 2 may refer to parameters of the outer surface 21 of the lens model 2.
In some examples, lens model 2 may have a marking. Additionally, in some examples, the markings of lens model 2 may correspond to contact lens S. For example, the markings of the lens model 2 may correspond to the central axis of the contact lens S, the markings of the lens model 2 may correspond to the axial direction of the contact lens S, etc.
In other examples, lens model 2 may have markings related to the sagittal depth of contact lens S. This can facilitate measurement of toric lenses (contact lenses S with astigmatism). For example, lens model 2 may have a sagittal deep axis indicium that corresponds to the sagittal deep axis of contact lens S. Further, the markings of the lens model 2 may be marked depending on the specific structure, design, etc. of the contact lens S.
In some examples, in step S10, before separating the lens model 2 from the contact lens S (e.g., after removing excess cured molding material 1), the lens model 2 may be marked to form a mark. This enables formation of the marked lens model 2. For example, before separating the lens model 2 from the contact lens S, the lens model 2 may be marked to form a mark related to the sagittal depth of the contact lens S.
In some examples, the lens model 2 may be marked using a marking tool. For example, a marking tool such as a pen, a blade, a toothpick, or the like may be used to mark the lens mold 2 to form a mark.
In some examples, the outer surface 21 of the lens model 2 may have a plurality of contour zones that match a plurality of arc zones of the contact lens S, respectively. In other words, the lens model 2 may have a plurality of contour areas that match a plurality of arc areas of the contact lens S.
As described above, the contact lens S may have multiple zones of curvature, the inner lens surface S1There may be multiple arc zones. In some examples, the lens model 2 may have a plurality of contour regions that respectively match a plurality of arc regions of the contact lens S. In other words, the lens model 2 may have a plurality of contour areas that coincide with a plurality of arc areas of the contact lens S. Further, a plurality of contour areas of the lens model 2 may be formed on the outer surface 21 of the lens model 2.
In some examples, as described above, contact lens S may be a scleral contact lens 3 having an optical region 3a, a mid-peripheral filling region 3b, and a limbal filling region 3c (see fig. 1). That is, the inner surface 31 of scleral contact lens 3 may have three zones corresponding to optical zone 3a, intermediate peripheral filling zone 3b and limbal filling zone 3c, respectively. Thereby, parameters of the inner surfaces of the optical zone 3a, the intermediate peripheral filling zone 3b and the limbal filling zone 3c of the scleral contact lens 3 can be measured.
In some examples, the outer surface 21 of the lens model 2 formed by molding the scleral contact lens 3 may have an optical profile zone, a mid-peripheral profile zone, and a limbal profile zone that match the optical zone 3a, the mid-peripheral filling zone 3b, and the limbal filling zone 3c, respectively. In particular, the outer surface 21 of the lens model 2 formed by molding the scleral contact lens 3 may have an optical profile zone, a mid-peripheral profile zone, and a limbal profile zone that match the inner mirror surface of the optical zone 3a, the inner mirror surface of the mid-peripheral filling zone 3b, and the inner mirror surface of the limbal filling zone 3c, respectively.
In some examples, the parameters of the outer surface 21 of the lens model 2 formed by shaping the scleral contact lens 3 may include parameters of the inner specular surface of the optical zone 3a, parameters of the inner specular surface of the intermediate peripheral filling zone 3b, and parameters of the inner specular surface of the limbal filling zone 3 c.
In some examples, the parameters of the inner specular surface of optical zone 3a, the parameters of the inner specular surface of intermediate peripheral filling zone 3b, and the parameters of the inner specular surface of limbal filling zone 3c may be obtained by measuring the parameters of the optical profile zone, the intermediate peripheral profile zone, and the limbal profile zone.
In some examples, as shown in fig. 1, scleral contact lens 3 may also include a positioning region 3 d. In addition, the positioning region 3d may surround the limbal filling region 3 c. Furthermore, the thickness of the positioning region 3d may gradually decrease from the interface with the limbal filling region 3c to the edge of the scleral contact lens 3.
In some examples, the outer surface 21 of the lens model 2 formed by molding the scleral contact lens 3 may have a positioning profile area that matches the positioning area 3 d. In addition, by measuring the parameters of the localization profile area, the parameters of the inner mirror surface of the localization area 3d can be obtained.
In some examples, in step S10, the lens model 2 formed by curing the cured molding material 1 may be stable and not easily deformed.
In some examples, after removing the excess cured molding material 1, the step S20 may be started.
In the present embodiment, as shown in fig. 2, the method of measuring the parameters of the contact lens S may include separating the lens model 2 from the contact lens S (step S20). Thereby, an individual lens model 2 can be obtained. In other words, the lens model 2 can be detached from the contact lens S to obtain an individual lens model 2.
In some examples, in step S20, the separation may be performed with an auxiliary tool having a pointed end. For example, the lens mold 2 and the contact lens S may be separated using an auxiliary tool having a sharp tip such as a toothpick, a needle, or the like.
In some examples, after the lens model 2 is separated, step 30 may begin to be performed. In some further examples, the method of measuring a parameter of the contact lens S may include measuring the lens model 2 using the keratoscope 4 to obtain a parameter of the contact lens S. In addition, an image relating to the lens model 2 can be formed using the corneal topographer 4, such as a topographical image that can characterize the surface topography of the outer surface 21 of the lens model 2.
In some examples, as shown in fig. 2, the method of measuring parameters of the contact lens S may include measuring the surface topography of the outer surface 21 of the lens model 2 using the keratographer 4 to obtain parameters of the contact lens S from the surface topography (step S30).
Fig. 5 is a scene schematic diagram illustrating lens model 2 measurements according to an example of the present disclosure.
In some examples, the corneal topographer 4 may include an image acquisition system and a computer system (not shown). In addition, in some examples, in step S30, during the measurement of the lens model 2, the lens model 2 may be placed in front of the image acquisition system of the corneal topographer 4 (see fig. 5).
In some examples, in step S30, as shown in fig. 5, in the process of measuring the lens model 2, the lens model 2 may be placed within the projection range of the corneal topographer 4. This enables detection of the lens model 2.
In some examples, in step S30, during the measurement of the lens model 2, the outer surface 21 of the lens model 2 is inspected by the keratographer 4, generating a topographical image that characterizes the surface topography of the outer surface 21 of the lens model 2.
Fig. 6 is a schematic view showing that the lens model 2 according to the example of the present disclosure is fixed to the auxiliary plate 5.
In some examples, in step S30, as shown in fig. 5 and 6, in the process of measuring the lens model 2, the lens model 2 may be fixed and arranged within the projection range of the keratoscope 4 using the auxiliary plate 5. This can facilitate measurement using the corneal topographer 4. In other words, the auxiliary plate 5 can be used to fix the lens model 2 and be arranged in front of the image acquisition system of the corneal topographer 4.
In some examples, in step S30, as shown in fig. 5 and 6, during the measurement of the lens model 2, optionally, the bottom part 22 is fixed by means of adhesion to the auxiliary plate 5 and the outer surface 21 of the lens model 2 is directed towards the corneal topographer 4. Thereby, the outer surface 21 of the lens model 2 can be easily inspected.
In some examples, the lens model 2 may be fixed to the auxiliary plate 5 by means of adhesion, as described above (see fig. 6). Specifically, the bottom 22 of the lens model 2 may be fixed to the auxiliary plate 5 by means of adhesion.
In some examples, as described above, during measurement of the lens model 2, the outer surface 21 of the lens model 2 may be directed toward the corneal topographer 4 (see fig. 5). In particular, the outer surface 21 of the lens model 2 may face the image acquisition system of the corneal topographer 4.
In some examples, in step S30, as shown in fig. 5, the auxiliary plate 5 may be fixed to the corneal topographer 4. Additionally, in some examples, auxiliary plate 5 may be affixed to corneal topographer 4 by adhesive, snap fit, or threaded means.
In some examples, in step S30, the auxiliary plate 5 may be fixed in front of the image acquisition system of the corneal topographer 4.
In some examples, in step S30, the corneal topographer 4 may photograph the lens model 2 to generate a topographical image of the lens model 2. In particular, the corneal topographer 4 may photograph the outer surface 21 of the lens model 2 to generate a topographical image that characterizes the surface topography of the outer surface 21 of the lens model 2.
In some examples, in step S30, the corneal topographer 4 may photograph the annular image projected onto the outer surface 21 of the lens model 2 to generate a topographical image that characterizes the surface topography of the outer surface 21 of the lens model 2.
In some examples, in step S30, parameters of the outer surface 21 of the lens model 2 may be obtained from the topography image. Additionally, in some examples, in step S30, parameters of the contact lens S may be obtained from parameters of the outer surface 21 of the lens model 2. That is, the parameters of the contact lens S can be obtained from the topographic image.
In some examples, in step S30, the computer system of the corneal topographer 4 may perform a computational analysis on the topographic image of the outer surface 21 of the lens model 2 to obtain parameters of the outer surface 21 of the lens model 2 to obtain an inner mirror surface S of the contact lens S that matches the outer surface 21 of the lens model 21The parameter (c) of (c).
In some examples, the parameter of the contact lens S measured using the corneal topographer 4 in step S30 may be the radian of the base curve, the eccentricity (e-value) of the base curve, or the like.
In some examples, in step S30, the image formed by the corneal topographer 4 may be a two-dimensional image, a three-dimensional image, a height map, a tangent map, etc., depending on actual needs. For example, a three-dimensional topography image characterizing the surface topography of the outer surface 21 of the lens model 2 can be formed using the corneal topographer 4.
In some examples, after measurement using the corneal topographer 4, the lens model 2 may be cut and parameters of the contact lens S (e.g., angles and diameters of multiple arcs) measured using the gauge 6. Specifically, the lens model 2 may be cut and the contact lens S (inner lens surface S) further measured using the gauge 61) Angle and diameter of the plurality of arc zones.
In some examples, the method of measuring parameters of the contact lens S may include cutting the lens model 2 and forming at least one model under test 2 a.
Fig. 7 is a schematic structural diagram showing a model under test 2a according to an example of the present disclosure.
In some examples, the lens model 2 may be cut to form a model 2a to be tested (see fig. 7). In other examples, a vertical cut may be made to the lens model 2. In addition, cutting the lens mold 2 may form a plurality of models to be measured 2 a. For example, 2, 3, 4 or 6 models 2a to be measured may be formed.
In some examples, as shown in fig. 7, the model under test 2a may have a cut surface 23. In addition, as shown in fig. 7, the model to be measured 2a may have a surface 21a and a bottom surface 22 a. The surface 21a of the mold 2a to be tested may be formed by cutting the outer surface 21 of the lens mold 2, and the bottom surface 22a of the mold 2a to be tested may be formed by cutting the bottom 22 of the lens mold 2.
In some examples, the cutting may be performed according to a marking on the lens model 2. In other examples, the model 2a to be measured having the cut surface 23 may be cut down in the center on the markings of the lens model 2.
In some examples, the cutting may be performed using a cutting tool. For example, cutting may be performed using a cutting tool such as a sharp blade, a ruler, or the like. In addition, the lens mold 2 may be fixed by hand or other tool when cutting.
In some examples, the two models to be measured 2a can be formed by cutting along the central axis mark on the lens model 2. In addition, in some examples, cutting along the lens model 2 bi-vector depth axis marker may form two under-test models 2a with different vector depths.
In some examples, the model under test 2a may be symmetric. Therefore, the accuracy of measurement can be improved. For example, the model under test 2a may be left-right symmetric, that is, the model under test 2a may be symmetric with respect to the mid-vertical plane of the cut surface 23.
In some examples, the model under test 2a may have multiple measurement zones that match multiple arc zones of the contact lens S. In other examples, the parameters of the multiple measurement zones of the model under test 2a may be consistent with the parameters of the multiple arc zones of the contact lens S corresponding thereto. In addition, the parameters of the model under test 2a may refer to parameters of a plurality of measurement regions of the model under test 2 a.
In some examples, the plurality of measurement areas of the model under test 2a may be formed by cutting a plurality of contour areas of the lens model 2.
In some examples, the model under test 2a may be measured to obtain parameters of the model under test 2 a. In other examples, the model under test 2a may be measured using a projection method. In addition, in some examples, the parameters of the model under test 2a may be measured using the survey meter 6 (see fig. 8). In some examples, a plurality of models to be measured 2a may be measured separately.
In other examples, in measuring the model under test 2a, a plurality of measurement regions of the model under test 2a may be measured. In addition, the parameters of the model under test 2a may be the angles and diameters (or radii) of a plurality (or one) of the measurement regions of the model under test 2 a.
In some examples, the parameters of the lens model 2 may be obtained from the parameters of the model under test 2 a. In addition, the parameters of the model to be measured 2a can be obtained from the parameters of the lens model 2. Further, in addition, the parameters of the lens model 2 may be the angles and diameters of a plurality (or one) of the contour regions of the lens model 2.
In some examples, optionally, the at least one model under test 2a is measured by using the measuring instrument 6, and the parameters of the lens model 2 are obtained according to the measurement result of the at least one model under test 2a, so as to obtain the parameters of the contact lens S corresponding to the lens model 2. Thereby, the parameters of the contact lens S can be further measured.
In some examples, during the measurement of the model under test 2a, the surveying instrument 6 may acquire an image of the model under test 2 a. For example, the surveying instrument 6 may obtain an image of the model 2a to be measured by scanning or photography.
In some examples, the surveying instrument 6 may perform a measurement analysis on the image to obtain a measurement result. For example, the measurement instrument 6 may perform measurement analysis by measurement software or a measurement tool (such as a built-in XY counter, a goniometer).
In some examples, the surveying instrument 6 may be a stereo microscope or a high-precision projector. This enables measurement by a projection method. The high-precision projector can be a projection device with measurement software or a built-in XY counter, a goniometer and a digital display.
Fig. 8 is a schematic view showing a scenario of the measurement of the model under test 2a according to an example of the present disclosure. Fig. 9 is an enlarged schematic view showing the model 2a to be measured in fig. 8.
In some examples, as shown in fig. 8, the surveying instrument 6 may have a stage 61. In addition, in some examples, as shown in fig. 8 and 9, in the process of measuring the model to be measured 2a, the cut surface 23 of the model to be measured 2a may be placed on the stage 61 of the surveying instrument 6 to perform the measurement. Thereby, it is possible to facilitate measurement of parameters of the surface 21a of the model to be measured 2a, that is, to measure the angle and diameter of the measurement region of the model to be measured 2 a. In other words, the cut surface 23 of the model 2a to be measured can be attached to the stage 61 of the surveying instrument 6 for measurement.
In some examples, the meter 6 may be calibrated prior to measurement. Therefore, the accuracy of measurement can be improved. In addition, the measurement can be performed at room temperature of 15 to 25 ℃.
In some examples, the parameters of each measurement region of the model under test 2a may be measured separately.
In some examples, when measuring an angle using the measuring instrument 6, a reference line may be made to coincide with a tangent line of the measurement area of the model under test 2a, and then a reading on one side is obtained, and then a reading on the other side is obtained by measuring the other side of the model under test 2a in symmetry, and the readings on the other side are added to take an average value as an angle value.
In some examples, angles symmetrical on both sides of the measurement area of the model under test 2a may be measured simultaneously by an angle square of the software and averaged as an angle value. In addition, the angle of the arc zone corresponding to the contact lens S can be obtained according to the obtained angle value.
In the present embodiment, by obtaining the lens model 2 corresponding to the contact lens S by the cured molding material 1 and detecting the lens model 2 by using the keratometer 4, in this case, the parameters of the lens model 2 can be accurately obtained by measuring the parameters of the cured lens model 2, and the parameters of the contact lens S can be accurately obtained. In addition, the parameters of the contact lens S are further obtained by cutting and measuring the lens model 2. The parameters of the contact lens S are obtained by measuring the solidified lens model 2 and the model to be measured 2a, so that the influence of interference factors such as direct measurement of the contact lens S can be avoided, and the parameters of the contact lens S can be accurately measured.
According to the present disclosure, a method of measuring a parameter of a contact lens S that can improve measurement accuracy can be provided.
While the present disclosure has been described in detail above with reference to the drawings and the embodiments, it should be understood that the above description does not limit the present disclosure in any way. Those skilled in the art can make modifications and variations to the present disclosure as needed without departing from the true spirit and scope of the disclosure, which fall within the scope of the disclosure.
Claims (10)
1. A method of measuring a parameter of a contact lens having an inner lens surface and an outer lens surface, comprising: preparing a curing molding material, molding and curing the contact lens by using the curing molding material, and forming a curing molded lens model containing the contour of the inner lens surface of the contact lens; separating the lens mold from the contact lens, the lens mold having an outer surface that matches the inner lens surface, the outer surface being formed as a smooth surface; and measuring the surface topography of the outer surface of the lens model by using a corneal topographer so as to obtain the parameters of the contact lens through the surface topography, wherein in the process of measuring the lens model, the lens model is placed in the projection range of the corneal topographer, the outer surface of the lens model is detected by the corneal topographer, a topography image representing the surface topography of the outer surface of the lens model is generated, and the parameters of the contact lens are obtained according to the topography image.
2. The method of claim 1, wherein:
in molding the contact lens, the cured molding material is filled in the concave inner mirror surface of the contact lens and covers the edge of the contact lens to form the lens mold.
3. The method of claim 1, wherein:
in the measurement of the lens model, the lens model is fixed and arranged within the projection range of the corneal topographer using an auxiliary plate.
4. The method of claim 3, wherein:
the lens model also has a base portion adhesively secured to the auxiliary plate with the outer surface of the lens model facing the corneal topographer.
5. The method of claim 2, wherein:
when the contact lens is filled with the solidified molding material, the solidified molding material is injected into the inner lens surface of the contact lens from the center to the edge in a spiral manner.
6. The method of claim 1, wherein:
the method comprises the steps of cutting the lens model to form at least one model to be measured, measuring the at least one model to be measured by using a measuring instrument, and obtaining parameters of the lens model according to the measurement result of the at least one model to be measured so as to obtain the parameters of the contact lens corresponding to the lens model.
7. The method of claim 1 or 6, wherein:
prior to separating the lens model from the contact lens, the lens model is marked to form a mark related to the sagittal depth of the contact lens.
8. The method of claim 6, wherein:
and in the process of measuring the model to be measured, placing the cutting surface of the model to be measured on an objective table of the measuring instrument for measurement.
9. The method of claim 1, wherein:
the curing molding material is an impression material, and the impression material is a silicone rubber impression material, a polysulfide rubber impression material, a polyether rubber impression material, an agar gel impression material, impression gypsum or zinc oxide clove oil paste.
10. The method of claim 1 or 6, wherein:
the contact lens is a corneal contact lens, a corneal shaping lens or a scleral contact lens with a plurality of arc zones.
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| CN2020106220176 | 2020-07-01 | ||
| CN202010622017.6A CN111595251A (en) | 2020-07-01 | 2020-07-01 | Method for measuring parameters of contact lenses |
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| CN202011473374.7A Active CN112461142B (en) | 2020-07-01 | 2020-12-15 | Method for measuring parameters of contact lenses |
| CN202011473372.8A Active CN112361974B (en) | 2020-07-01 | 2020-12-15 | Method for measuring parameters of contact lenses |
| CN202211192839.0A Pending CN115615334A (en) | 2020-07-01 | 2020-12-15 | Method for measuring parameters of contact lens |
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- 2020-12-15 CN CN202011473374.7A patent/CN112461142B/en active Active
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| CN115615334A (en) | 2023-01-17 |
| CN111595251A (en) | 2020-08-28 |
| CN112461142A (en) | 2021-03-09 |
| CN112361974B (en) | 2022-07-15 |
| CN112461142B (en) | 2022-08-05 |
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