CN1831582A - Method of designing progressive diopter lens group - Google Patents
Method of designing progressive diopter lens group Download PDFInfo
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- CN1831582A CN1831582A CN 200610056898 CN200610056898A CN1831582A CN 1831582 A CN1831582 A CN 1831582A CN 200610056898 CN200610056898 CN 200610056898 CN 200610056898 A CN200610056898 A CN 200610056898A CN 1831582 A CN1831582 A CN 1831582A
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Abstract
Provided is a method of designing a progressive refracting power lens group, in which the refractive indexes of materials of progressive refracting power lenses are identical and which enables viewing an object in the same attitude as with a lens replaced with a progressive refracting power lens, having a different refractive power in the progressive refracting power lens group, where the design concepts of the progressive refracting power lenses have been unified, even when it is changed. The position of a second refractive section is changed vertically, to make prism refracting power constant at a refractive power measurement point of the second refractive section for seeing an object at a close range, and a progressive zone length is increased or decreased, according to the refractive power of the second refractive section.
Description
Technical field
The present invention relates to the method for designing of progressive-power lens set, described progressive-power lens set is the set based on same design philosophy that is used to compensate the hypodynamic progressive-power eyeglass of the caused adjusting of presbyopia.
Background technology
The progressive-power eyeglass has: the portion that uses far away that is used to observe comparison top at a distance; Be used to observe the nearly portion that uses of bottom more nearby; And far away with portion with between closely with portion, the progressive portion that little by little changes of refractive power.Generally will be far with portion and closely with the distance between the portion, be that the length of progressive portion is called progressive belt length.In the progressive-power eyeglass,, therefore be difficult to judge the length of progressive belt length according to eyeglass owing on eyeglass, there is not the separatrix of usefulness portion far away and nearly usefulness portion.But, in the explanation of instructions, will be on the principal meridian, far hold to the transition portion conduct in the zone that refractive power changes from the zone of refractive power almost fixed between with portion and progressive portion with the subordinate far away, will progressive and closely between the usefulness portion from refractive power change the zone to the part of the regional transition of nearly usefulness of refractive power almost fixed as nearly usefulness portion upper end, with this far with subordinate's end with closely be called progressive belt length with the distance between on the portion.
As shown in Figure 2, including on the progressive-power eyeglass 10 of selling the shop, with erasable ink be printed with frame in being encased in spectacle-frame go into to add the location marking or the assembling used man-hour put a F, be used to measure far away from refractive power and the refractive power reference circle etc. that adds in-degree.Put Dp with far being called far with the center of refractive power reference circle 1 with refractive power measurement, the center that will add in-degree reference circle 2 is called closely puts Np with refractive power measurement.Although have slightly difference according to eyeglass manufacturer, a general assembling point F is set at from usefulness far away portion to the transition point of progressive portion, the upper end that adds in-degree reference circle 2 roughly with nearly usefulness portion on consistent.Therefore, can be simply the distance on the vertical direction till from assembling point F to the upper end that adds in-degree reference circle 2 be considered as progressive belt length.
Closely generally be located at peripheral part away from the central part of eyeglass with the portion zone.Since eyeglass far with refractive power or add the influence of in-degree, the peripheral part of eyeglass produces very large prism refractive power.For example provide one group of following progressive-power eyeglass to demander with identical trade name: design uniformly by certain design philosophy, with satisfy far with the photopic vision field width and closely with the fundamental as the progressive-power eyeglass of photopic vision field width etc. identical wear purpose.The progressive belt length of each the progressive-power eyeglass in the progressive-power lens set of same trade name is fixed.That is, closely use the stationkeeping of portion, and irrelevant with the value with refractive power far away.
In addition, shown in for example following patent documentation 1, just existed according to the imagination that closely changes the interior deviator of nearly usefulness portion with the prism effect of portion in the past.But the structure that this overlaps the sight line about the eyes apparent time exactly.In addition, before patent documentation 1, patent documentation 2, patent documentation 3, patent documentation 4, patent documentation 5 etc. also disclose the relevant invention of the location marking with the variation that can tackle nearly usefulness portion position, but all only mention with closely with interior corresponding partially displacement.
[patent documentation 1] TOHKEMY 2003-329984 communique
[patent documentation 2] TOHKEMY 2001-51241 communique
[patent documentation 3] TOHKEMY 2002-311396 communique
[patent documentation 4] TOHKEMY 2003-131175 communique
[patent documentation 5] TOHKEMY 2003-131176 communique
But, closely with the prism amount at refractive power measurement point Np place according to far with refractive power or add in-degree and change, therefore the position by nearly object point during with refractive power measurement point Np observation object changes according to these refractive powers.For example, in having the concavees lens of negative refractive power, shown in Fig. 3 (a), the position of object point is different on sight line L1 and sight line L2, this sight line L1 is the sight line towards the rotation center 0 of eyeball when observing object by the nearly concavees lens 11 that have a relative positive refractive power with portion's refractive power shown in the solid line, and this sight line L2 is the sight line towards the rotation center O of eyeball of near shown in the dotted line progressive-power eyeglass 12 that has relative negative refractive power with portion's refractive power.Therefore,, shown in Fig. 3 (b), need to change the angle of wearing of eyeglass, make the observation place of object point identical in order to observe specific object point with the different concavees lens of such refractive power.For example, in order to make the nearly progressive-power eyeglass 12 that has relative negative refractive power with portion's refractive power identical with respect to the position of nearly concavees lens 11, the object point that has relative positive refractive power with portion's refractive power, must make the nearly progressive-power eyeglass 12 that has a relative negative refractive power with portion's refractive power slightly up, thereby by closely observing object point with refractive power measurement point Np.
Convex lens with positive refractive power too, shown in Fig. 4 (a), the position of object point is different on sight line L3 and sight line L4, this sight line L3 represents, is the sight line when observing object by the nearly convex lens of being represented by solid line 21 that have a relative positive refractive power with portion's refractive power that by solid line this sight line L4 is illustrated by the broken lines, is the nearly sight line that has the progressive-power eyeglass 22 of relative negative refractive power with portion's refractive power that is illustrated by the broken lines.Therefore,, shown in Fig. 4 (b), need to change the angle of wearing of eyeglass, make the observation place of object point identical in order to observe specific object point with the different convex lens of such refractive power.Under the situation of eyeglass, all need to change up and down face towards, thereby by closely observing object with refractive power measurement point Np.
Like this, the progressive-power eyeglass has in the lens edge portion that the prism refractive power increases and is used to observe in-plant part, the pitch angle that must change head according to the refractive power of eyeglass is observed, in the progressive-power lens set of same trade name, when just having changed new eyeglass, till custom, can feel the trouble inconvenience.
Summary of the invention
The present invention In view of the foregoing finishes, its purpose is to provide the method for designing of progressive-power lens set, this progressive-power lens set constitutes: the refractive index of the material of each progressive-power eyeglass is identical and be unified into same design philosophy, even when having changed the refractive power progressive-power eyeglass different therein, also can observe object according to the posture identical with former eyeglass with former eyeglass.
In order to reach above-mentioned purpose, first, the invention provides a kind of method for designing of progressive-power lens set, it is characterized in that, for following progressive-power lens set: described progressive-power lens set is the set of progressive-power eyeglass, each progressive-power eyeglass has: the first dioptric portion with the refractive power that is used to observe the object that is positioned at the preset distance place, has the second dioptric portion that is used to observe the refractive power that is positioned at the object of closely locating, and the progressive portion that changes progressively to the described second dioptric portion from the described first dioptric portion of refractive power, described progressive-power lens set meets the following conditions: the described first dioptric portion that can select different refractive powers, can select a plurality of in-degrees that add for the described first dioptric portion with identical refractive power, the refractive index of material is identical, and the design philosophy of each progressive-power eyeglass is unified, design each progressive-power eyeglass as follows: have the identical progressive-power eyeglass that adds in-degree each other, in the little side of the refractive power of the described first dioptric portion, distance on the vertical direction between the refractive power measurement point of assembling point and the described second dioptric portion is shorter, at the identical progressive-power eyeglass of the refractive power of the described first dioptric portion each other, add among the big side of in-degree, the distance on the vertical direction between the refractive power measurement point of assembling point and the described second dioptric portion is longer.
It is identical and be unified into a plurality of progressive-power eyeglasses of identical design philosophy to include the refractive index of material in the progressive-power lens set of selling with same trade name.In addition, can be from the refractive power that is suitable for wearer's the first dioptric portion with selection the different a plurality of progressive-power eyeglasses of the refractive power of the portion or the first dioptric portion far away, and can select the different in-degrees that adds for the refractive power of the same first dioptric portion, the described first dioptric portion be positioned at eyeglass top, be used to observe the object that is positioned at the intermediate distance place.In the past, the progressive belt length of each the progressive-power eyeglass that is comprised in progressive-power lens set was fixed.
But, known to the inventor, by on above-below direction, changing the position that is used to observe the second dioptric portion that is positioned at the object of closely locating, make the prism refractive power on the refractive power measurement point of the second dioptric portion fix, even be replaced by refractive power with before the situation of the different progressive-power eyeglass of eyeglass under, also can observe object with the posture identical with former eyeglass.For the prism refractive power on the refractive power measurement point that makes the second dioptric portion is fixed, reach by following method: during two eyeglasses in more gradual refractive power lens set, if it is identical to add in-degree, then far away with portion or be used for observing the little eyeglass of the refractive power of the first dioptric portion that is positioned at eyeglass top of the object that is positioned at the intermediate distance place, promptly have a more eyeglass of the refractive power of minus side, the refractive power of the first dioptric portion is bigger, promptly compare lens edge portion thickening with the eyeglass of the refractive power with more positive side; Be used for observing the in-plant second dioptric portion that is present in lens edge portion, because the prism refractive power increases, therefore the upper end with the second dioptric portion is configured in more upside, consequently, has shortened progressive belt length.In addition, reach by following method: during two eyeglasses in more gradual refractive power lens set, if the refractive power of the first dioptric portion is identical, then adding the big eyeglass of the in-degree eyeglass little with adding in-degree compares, the refractive power of the second dioptric portion is in positive side, and the prism refractive power reduces, and therefore the upper end with the second dioptric portion is configured in more downside, consequently, increased progressive belt length.
In addition, owing to be difficult to judge progressive belt length, therefore represent progressive belt length substantially with the distance on the vertical direction between the refractive power measurement point of the assembling point of easy actual measurement and the second dioptric portion according to eyeglass.
Second, the invention provides a kind of method for designing of progressive-power lens set, it is characterized in that, in the method for designing of the above-mentioned first progressive-power lens set, design each progressive-power eyeglass as follows: be not under zero the situation at the astigmatic refractive power at the refractive power measurement point place of the described first dioptric portion, at the identical progressive-power eyeglass of the refractive power that adds in-degree and the described first dioptric portion each other, in the little progressive-power eyeglass of the vertical direction component of the astigmatic refractive power of the refractive power of the described first dioptric portion, the distance on the vertical direction between the refractive power measurement point of assembling point and the described second dioptric portion is shorter.
Even under the situation that is provided with refractive surfaces such as the cylinder refractive surface that is used for astigmatism or double-curved surface, also produce the prism refractive power thus.When the identical eyeglass of the refractive power that adds the in-degree and the first dioptric portion in the progressive-power lens set is compared each other, the refractive power of vertical direction component of astigmatism refractive power is little, promptly have more that the prism refractive power of eyeglass on the substrate direction of the refractive power of minus side increases, therefore the upper end with the second dioptric portion is configured in more upside, consequently, by shortening progressive belt length, realize making the prism refractive power on the refractive power measurement point of the second dioptric portion in lens set, to be maintained fixed.
The 3rd, the invention provides a kind of method for designing of progressive-power lens set, it is characterized in that, in the method for designing of technical scheme 1 or 2 described progressive-power lens set, distance on being made as the distance on the vertical direction between the refractive power measurement point of described assembling point and the described second dioptric portion from following first crossover position to the vertical direction of second crossover position, described first crossover position is: on principal meridian, from the zone of the refractive power almost fixed of the described first dioptric portion to the crossover position in the zone that refractive power changes, described second crossover position is: between described progressive and the described second dioptric portion, change the nearly position with the zone that the zone carries out the transition to the refractive power almost fixed from refractive power.
If can determine the progressive belt length of the reality of eyeglass, then need not to use the distance that is considered as progressive belt length simply.
Description of drawings
Fig. 1 (a) and (b) are expression planimetric maps by an example of the eyeglass of the method for designing design of progressive-power lens set of the present invention.
Fig. 2 is the planimetric map of the layout of expression progressive-power eyeglass.
Fig. 3 represents that the caused sight line of the refractive power of concavees lens is poor, and (a) sight line under the situation of position of eyeglass is not changed in expression, (b) sight line under expression the situation that eyeglass is tilted.
Fig. 4 represents that the caused sight line of the refractive power of convex lens is poor, and (a) sight line under the situation of position of eyeglass is not changed in expression, (b) sight line under expression the situation that eyeglass is tilted.
Fig. 5 (a) and (b) are concept maps of the vertical direction component of the astigmatic refractive power of expression.
Embodiment
Below, the embodiment of the method for designing of progressive-power lens set of the present invention is described, but the present invention is not limited to following embodiment.
The method for designing of progressive-power eyeglass of the present invention designs each the progressive-power eyeglass as the progressive-power lens set of the set of following progressive-power eyeglass: offer the person of needs with same trade name, unified design philosophy, with satisfy far with the photopic vision field width and closely with the fundamental as the progressive-power eyeglass of photopic vision field width etc. identical wear purpose.
The presbyopia person's that the adjusting power that mainly is used as the progressive-power eyeglass weakens vision correction eyeglass.As shown in Figure 2, the progressive-power eyeglass has on an eyeglass: have observe be positioned at a distance or during the object at intermediate distance place the top of required refractive power the first dioptric portion 31, when having nearby object of observation the bottom of required refractive power the second dioptric portion 32, from progressive 33 of 31 to second dioptric portions of the first dioptric portion, 32 refractive power continually varying, do not have the separatrix on it, thereby fashion is good.
The kind of design of progressive-power eyeglass has multiple, for example, the kind of design by purposes is arranged.In the progressive-power eyeglass of the far and near type of what is called, have: being used to of eyeglass top observe distant objects far away with portion, be used to observe near below the eyeglass of near objects with portion, from the progressive starting point of top to progressive portion that refractive power the progressive end point of below changes progressively.Design philosophy is: balance disposes usefulness far away portion and nearly two sides of usefulness portion well, and making progressive belt length is about 10～16mm, thereby eyes is rotated easily when observing nearby.Assembling point general with far with the center, be that progressive starting point is consistent.The progressive-power eyeglass of nearly type has in the what is called: the eyeglass upper end be used to observe the far away of distant objects with the nearly progressive portion that refractive power changes progressively with portion, between them of the zone that is used to observe object nearby below portion, the eyeglass than broad.Progressive belt length is increased for the wide visual field of apparent time in the middle of realizing to be designed to about 19～25mm.Assembling point generally is positioned at progressive of observing the object that is positioned at the distance before and after the 1m and locates.In the progressive-power eyeglass of the nearly nearly type of what is called, have: the eyeglass top be used to observe pars intermedia at the object at intermediate distance place, the zone that is used to observe object nearby below the eyeglass the nearly progressive portion that refractive power changes progressively with portion, between them than broad.Progressive belt length is increased for the wide visual field of apparent time in the middle of realizing to be designed to about 19～25mm.And then, in the distribution design of distortion aberration and astigmatism, can roughly be divided into: widen far away with portion and near with portion, make aberration concentrate on aberration concentrated on narrow progressive; And constriction far with portion and near with portion, widen progressive and aberration decentralized that the aberration in the pars intermedia is spread.
The progressive-power lens set of the set of a plurality of progressive-power eyeglasses of carrying out with same trade name is designed to: the refractive index of lens materials is identical, unified following design philosophy, each the progressive-power eyeglass that constitutes the progressive-power lens set satisfies the common purpose of wearing, and described design philosophy is that to be positioned at object side (exterior side) still be eyeball side (inner face side) etc. for refractive power variations of above-mentioned kind of design by purposes, the distribution of aberration, progressive portion, the photopic vision field width of the first dioptric portion, the photopic vision field width of the second dioptric portion, progressive refractive surface.
Because progressive belt length is the significant design item of the design philosophy of decision progressive-power eyeglass, and is therefore in same progressive-power lens set, all identical in each progressive-power eyeglass usually.
But, in the identical progressive-power lens set of progressive belt length, increase and from same progressive-power lens set, buy under the situation of other different progressive-power eyeglass of the number of degrees (refractive power) at the number of degrees of eyes, object point position by closely with refractive power measurement point Np observation object the time is different with previously used eyeglass, therefore, in order to observe the position of object point in the same manner, need change up and down face towards and change the angle of wearing of eyeglass, make by the observed object point of eyeglass position identical, when just being replaced by new eyeglass, feel the trouble inconvenience, till custom.
Usually, the refractive power of the second dioptric portion (closely using portion) on mathematics a little side, promptly closely have the eyeglass of more negative refractive power with portion's refractive power, its closely in usefulness the portion with respect to 270 of substrate spend on the directions the prism degree change greatly.Refractive status in two different negative refractive power eyeglasses of refractive power has been shown in Fig. 3 a.Eyeglass 12 shown in the dotted line is compared with the eyeglass 11 shown in the solid line has more negative refractive power.Therefore, with the prism degree on the 270 degree directions at refractive power measurement point Np place, 12 1 sides are bigger for eyeglass, reflect downwards than passing through the light L1 shown in the solid line of eyeglass 11 by the light L2 shown in the dotted line of eyeglass 12 about closely.Being positioned under the situation of the object on the same position with eyeglass 11 and 12 observations, shown in Fig. 3 (b), need mention whole eyeglass 12, thereby make the aligned in position of light, for this reason, the wearer of eyeglass 12 must stretch out lower jaw and raise face.
Under the situation of positive refractive power eyeglass, shown in Fig. 4 (a), the side that refractive power is little, promptly the prism degree of closely spending on the directions with the substrate 90 at refractive power measurement point Np place of the more negative eyeglass that is illustrated by the broken lines 22 reduces, and the light L3 that represents with solid line that the light L4 that is illustrated by the broken lines by eyeglass 22 compares by the eyeglass of being represented by solid line 21 reflects downwards.Therefore, shown in Fig. 4 (b), the wearer of eyeglass 21 compares during with lenses fitted 22, must regain lower jaw and reduces face and observe object.
Above phenomenon be since as the different eyeglass of refractive power, simultaneously the second dioptric portion closely identical with the position of refractive power measurement point Np, be that progressive belt length is fixed the drawback that produces.In the method for designing of progressive-power lens set of the present invention, change according to the refractive power of the second dioptric portion of eyeglass the progressive-power eyeglass second dioptric portion each other that constitutes lens set closely with the position of refractive power measurement point Np, prism refractive power on the Np of measuring position is fixed, thereby no matter which eyeglass in the same lens set of selection, all there is not difference fully on the posture when observing object, even perhaps variant slightly, also can suppress the sense of wearing for the degree of the imperceptible discomfort of wearer.Promptly, at the refractive power of the second dioptric portion is under the situation of more negative refractive power, by making the close eyeglass central portion in nearly position of the second dioptric portion with refractive power measurement point Np, can reduce the prism degree on the substrate 270 degree directions, owing to, therefore can reduce the difference of wearing sense near having the sight line of the eyeglass of more positive refractive power.In the method for designing of progressive-power lens set of the present invention, from the notion of unified design philosophy, removed progressive belt length.
The second dioptric portion closely with the prism refractive power at refractive power measurement point Np place according to the refractive power of the first dioptric portion and add in-degree and change.No matter in order to select which eyeglass in the progressive-power lens set, the near of the second dioptric portion fixed with the prism refractive power at refractive power measurement point Np place, adding under the fixing situation of in-degree, the lens design in the progressive-power lens set is become: it is shorter that the refractive power of the first dioptric portion has the progressive belt length of eyeglass of more negative refractive power.But, because progressive belt length is difficult to actual measurement in the eyeglass of reality, therefore in this manual, with the assembling point and by add the second dioptric portion that the in-degree reference circle represents near with the refractive power measurement point, be preferably and the upper end between vertical direction on distance represent progressive belt length simply.The prerequisite of this simple progressive belt length is the stationkeeping that adds the upper end of the in-degree measuring position and the second dioptric portion.Certainly, if can survey progressive belt length, the distance on promptly from following first crossover position to the vertical direction of second crossover position, then preferably use this measured value, described first crossover position is: on principal meridian, from the zone of the refractive power almost fixed of the first dioptric portion to the crossover position in the zone that refractive power changes; Described second crossover position is: between progressive and the second dioptric portion, change the nearly position with the zone that the zone carries out the transition to the refractive power almost fixed from refractive power.
In addition, with the lens design in the progressive-power lens set be: in the progressive-power eyeglass that the refractive power of the first dioptric portion in a progressive-power lens set is fixed, the progressive belt length that adds the big eyeglass of in-degree is longer.This be because: under the fixing situation of the refractive power of the first dioptric portion, increase along with adding in-degree, the refractive power of the second dioptric portion is to positive side transition, and the prism refractive power reduces.
In addition, with the lens design in the progressive-power lens set be: under the situation that the refractive power of the second dioptric portion is fixed, the progressive belt length that adds the big eyeglass of in-degree is shorter.This be because: the refractive power of the second dioptric portion is identical, increases along with adding in-degree, and the refractive power of the first dioptric portion further becomes negative.
Above-mentioned progressive belt length is the relative value the when eyeglass in the progressive-power lens set is compared each other.If the design philosophy difference of eyeglass, then the absolute value of progressive belt length changes.In addition, if the refractive index difference of lens materials, even then same refractive power, the prism refractive power is also different, and therefore the absolute value of progressive belt length also changes.
Well-knownly be: if in the progressive-power eyeglass, shorten progressive belt length, the distortion of the picture of feeling when then wearing or rock increase.Thereby, perhaps can think in the eyeglass of more negative refractive power, to make and closely shorten the drawback that the way of progressive belt length causes designing near center of lens portion with the measuring position Np of portion.But, according to the inventor's research, as can be known generally with the physiognomy ratio that uses positive refractive power, the people who wears the eyeglass of negative refractive power is difficult to feel the distortion of picture or rock.This thinks: for the eyeglass of negative refractive power, because picture seems less, therefore also be difficult to feel the distortion of picture or rock.Thereby, even shorten the progressive belt length of negative refractive power eyeglass, because the distortion of picture or rock the sense of discomfort of wearing that causes and also do not constitute problem.Otherwise, for the positive refractive power eyeglass of feeling easily to distort/rock, progressive belt length is elongated, can alleviate the distortion of eyeglass, therefore the method for designing of progressive-power lens set of the present invention has not only been improved and has been worn posture, but also can reduce the sense of discomfort when wearing.
Fig. 1 represents that the refractive index of lens materials is 1.67, is set to the design example of two different progressive-power eyeglasses of the refractive power of the unified progressive-power lens set of the design philosophy of the progressive-power eyeglass of the inner face progressive-power eyeglass of eyeball side refractive surface, so-called far and near type and aberration decentralized according to progressive refractive surface.
Fig. 1 (a) is sphere refractive power S-8.00 diopter (following table is shown D), adds the progressive-power eyeglass 101 of in-degree ADD 2.00D that Fig. 1 (b) is the progressive-power eyeglass 102 of S-4.00D, ADD 2.00D.In each figure, represented far away with refractive power reference circle 1, an assembling point F, closely use refractive power reference circle (adding the in-degree measurement range) 2 and closely put Np, principal meridian M with refractive power measurement.Principal meridian M is from an assembling point F, considers that eye concentrates on the below and is offset to nasal side.In addition, show assembling point F and be progressive belt length closely with the distance between the upper end of refractive power reference circle 2.Closely the refractive power with portion is that eyeglass 101 is S-6.00D, and eyeglass 102 is S-2.00D.Adding in-degree is that two eyeglasses all are 2.00D, but at the progressive belt length with the more negative eyeglass 101 of portion's refractive power far away is 10.38mm, far the progressive belt length with the more positive eyeglass 102 of portion's refractive power is 12.28mm, and add under the identical situation of in-degree, far the progressive belt length with the eyeglass 101 of portion's refractive power more negative (littler) shortens.Closely the interior deviator with portion also can change according to the refractive power of eyeglass, but in the present embodiment, for explanation is understood easily interior deviator is fixed as 2.5mm.
In table 1, illustrated will according to the refractive power of the first dioptric portion of the unified progressive-power lens set of the refractive index of the lens materials identical and identical design philosophy with eyeglass shown in Figure 1 and add in-degree as parameter, assembling point F is shown and closely uses distance on the vertical direction between the upper end of reference circle (the refractive power measurement point of the second dioptric portion) 2 as the example of the length of progressive belt length.
[table 1]
| The refractive power S of usefulness portion (D) far away | Add in-degree ADD (D) | ||
| 1.00 | 2.00 | 3.00 | |
| +6.00 | 16.78 | 17.06 | 17.34 |
| +5.00 | 16.30 | 16.58 | 16.86 |
| +4.00 | 15.82 | 16.10 | 16.38 |
| +3.00 | 15.34 | 15.62 | 15.90 |
| +2.00 | 14.86 | 15.14 | 15.42 |
| +1.00 | 14.38 | 14.66 | 14.94 |
| 0.00 | 13.91 | 14.18 | 14.46 |
| -1.00 | 13.43 | 13.71 | 13.98 |
| -2.00 | 12.95 | 13.23 | 13.51 |
| -3.00 | 12.48 | 12.75 | 13.03 |
| -4.00 | 11.99 | 12.28 | 12.55 |
| -5.00 | 11.50 | 11.79 | 12.08 |
| -6.00 | 11.00 | 11.30 | 11.59 |
| -7.00 | 10.58 | 10.80 | 11.10 |
| -8.00 | 10.07 | 10.38 | 10.60 |
The refractive power of the first dioptric portion shown in the table 1 and add in-degree and set every 1D, but for example also more identical more meticulously than this every 0.5D.
Under the same situation that adds in-degree, become more negative (little refractive power) with portion's refractive power along with far away, progressive belt length shortens.In addition, under the identical situation of usefulness portion far away refractive power, increase along with adding in-degree, progressive belt length increases.And then, in the nearly eyeglass identical, add the progressive belt length of the big person of in-degree and shorten with refractive power.For example, far with the refractive power S+1.00D of portion, add in-degree ADD 1.00D eyeglass for closely to use refractive power S+2.00D, become with far with the eyeglass of the refractive power S 0.00D of portion, ADD 2.00D identical closely use refractive power.The former progressive belt length is 14.38mm, and the progressive belt length that adds the big latter of in-degree is 14.18mm, under the nearly situation identical with refractive power, increases along with adding in-degree, and progressive belt length shortens.
In the above description, put down in writing the not design of the progressive-power lens set of additional astigmatism correction characteristic.But in general eyeglass, except the sphere refractive power, the situation that also has astigmatic refractive power is a lot.Under the situation of astigmatic lens, closely change with the prismatic effect of portion direction according to the astigmatism axle.Therefore, having added the positive characteristic of astigmatic sedan-chair on any one party in the refractive surface of eyeball side or object side, measured astigmatic refractive power on the measuring position of refractive power of the first dioptric portion is not under zero the situation, can with by sphere refractive power and astigmatic refractive power synthetic form far away with in portion's refractive power, along the refractive power component of the direction of progressive band, promptly put the refractive power of F on the direction of the upper end that adds in-degree reference circle 2 and be considered as far using refractive power from assembling, carry out the design of progressive-power lens set.Specifically, be designed to: at the identical progressive-power eyeglass of the refractive power that adds the in-degree and the first dioptric portion each other, the progressive-power eyeglass that the vertical direction component of the astigmatic refractive power of the refractive power of the first dioptric portion is little, assembling point and the distance measured on the vertical direction between the precalculated position that adds the in-degree measurement range of the second dioptric portion be shorter.
For example, as shown in Figure 5, suppose that time astigmatism axle becomes the situation of the angles of 45 degree with warp from the basic point on horizontal direction right side by optometry person from top view, the astigmatic refractive power of the eyeglass shown in Fig. 5 (a) is that the refractive power on the astigmatic direction of principal axis is-2.00D, refractive power on the warp direction vertical with the astigmatism axle is-6.00D that the component on the vertical direction is-4.00D.On the other hand, the astigmatism axle of the eyeglass shown in Fig. 5 (b) is positioned on the direction of warp 45 degree too, refractive power on the astigmatism direction of principal axis is-2.00D that the refractive power on the warp direction vertical with the astigmatism axle is-5.00D that the refractive power component on the vertical direction is-3.50D.Compare with the refractive power component on the vertical direction of the astigmatism of the eyeglass shown in Fig. 5 (d), refractive power component on the vertical direction of the astigmatism of the eyeglass shown in Fig. 5 (a) is little, promptly have more negative refractive power, therefore the eyeglass shown in Fig. 5 (a) is compared with the eyeglass shown in Fig. 5 (b), the prism refractive power at nearly usefulness portion measuring position Np place is bigger, need to be configured in more upside with the portion upper end nearly, and shorten progressive belt length.
In addition, for example, owing in fact be difficult to realize set the refractive power of the first dioptric portion meticulously or add the design of the progressive-power lens set of in-degree according to every 0.1D, therefore progressive belt length is fixed, but in the design of progressive-power lens set, according to above-mentioned nearly refractive power, be that the tendency that the prism refractive power increases and decreases progressive belt length does not change with portion.
In addition, in order to cut down manufacturing cost, can certainly consider in a certain refractive power scope (for example S-5.00D is to the scope of S-8.00D), to make progressive belt length identical.In this case, make a general survey of whole refractive power scope,, then can think to be included in the scope of the present invention if closely the progressive belt length that has an eyeglass of relatively more negative refractive power with portion is set shortly.
In addition, in the above description, be recited as: in order to represent progressive belt length simply, the definition assembling point and the second dioptric portion near with the distance on the vertical direction between the refractive power measurement point as progressive belt length, this precalculated position is preferably the upper end that adds the in-degree measurement range, but the progressive belt length of each progressive-power eyeglass is a relative value, so the precalculated position conduct that also certainly for example will add in the in-degree measurement range is closely put Np with refractive power measurement.
The method for designing of progressive-power lens set of the present invention designs as follows: no matter select conduct by which the progressive-power eyeglass in the progressive-power lens set of the set of the unified progressive-power eyeglass of same design philosophy, all can observe object, can be used as the method for designing that is used for compensating well the hypodynamic eyeglass of the caused adjusting of presbyopia with the posture identical with former eyeglass.
Claims (3)
1. the method for designing of a progressive-power lens set is characterized in that,
For following progressive-power lens set: described progressive-power lens set is the set of progressive-power eyeglass, each progressive-power eyeglass has: the first dioptric portion with the refractive power that is used to observe the object that is positioned at the preset distance place, has the second dioptric portion that is used to observe the refractive power that is positioned at the object of closely locating, and the progressive portion that changes progressively to the described second dioptric portion from the described first dioptric portion of refractive power, described progressive-power lens set meets the following conditions: the described first dioptric portion that can select different refractive powers, can select a plurality of in-degrees that add for the described first dioptric portion with identical refractive power, the refractive index of material is identical, and the design philosophy of each progressive-power eyeglass is unified
Design each progressive-power eyeglass as follows:
Have the identical progressive-power eyeglass that adds in-degree each other, in the little side of the refractive power of the described first dioptric portion, the distance on the vertical direction between the refractive power measurement point of assembling point and the described second dioptric portion is shorter,
At the identical progressive-power eyeglass of the refractive power of the described first dioptric portion each other, add among the big side of in-degree, the distance on the vertical direction between the refractive power measurement point of assembling point and the described second dioptric portion is longer.
2. the method for designing of progressive-power lens set as claimed in claim 1 is characterized in that, designs each progressive-power eyeglass as follows:
Not under zero the situation at the astigmatic refractive power at the refractive power measurement point place of the described first dioptric portion,
At the identical progressive-power eyeglass of the refractive power that adds in-degree and the described first dioptric portion each other, in the little progressive-power eyeglass of the vertical direction component of the astigmatic refractive power of the refractive power of the described first dioptric portion, the distance on the vertical direction between the refractive power measurement point of assembling point and the described second dioptric portion is shorter.
3. the method for designing of progressive-power lens set as claimed in claim 1 or 2 is characterized in that,
Distance on being made as the distance on the vertical direction between the refractive power measurement point of described assembling point and the described second dioptric portion from following first crossover position to the vertical direction of second crossover position, described first crossover position is: on principal meridian, from the zone of the refractive power almost fixed of the described first dioptric portion to the crossover position in the zone that refractive power changes, described second crossover position is: between described progressive and the described second dioptric portion, change the nearly position with the zone that the zone carries out the transition to the refractive power almost fixed from refractive power.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005064999 | 2005-03-09 | ||
| JP2005064999 | 2005-03-09 | ||
| JP2005369182 | 2005-12-22 |
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| CN1831582A true CN1831582A (en) | 2006-09-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610056898 Pending CN1831582A (en) | 2005-03-09 | 2006-03-09 | Method of designing progressive diopter lens group |
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