Eyeglass lens evaluation method, eyeglass lens design method, eyeglass lens manufacturing method, eyeglass lens manufacturing system, and eyeglass lens

Patent metadata

Field	Value
Publication number	US-9664591-B2
Application number	US-201113197346-A
Country	US
Kind code	B2
Filing date	Aug 3, 2011
Priority date	Feb 5, 2009
Publication date	May 30, 2017
Grant date	May 30, 2017

Abstract

With respect to the evaluation of custom-made eyeglass lenses using a binocular visual acuity function, a measurement value including essentially at least one of or both of a positive relative convergence or a negative relative convergence of the positive relative convergence, the negative relative convergence, a positive relative accommodation, a negative relative accommodation and a vertical fusional vergence is provided as a factor.

First claim

What is claimed is:

1. An eyeglass lens manufacturing method, comprising:
selecting relative measurement values from individual measurement values related to binocular vision of a wearer of eyeglasses, including: a positive relative convergence, a negative relative convergence, a positive relative accommodation, a negative relative accommodation and a vertical fusional vergence, using at least one of or both of the positive relative convergence and the negative relative convergence in the relative measurement values;
optimizing the binocular vision while using, as an evaluation function for calculation of the optimizing, a function obtained by adding binocular visual acuity functions including the relative measurement values as factors at respective evaluation points; and
manufacturing eyeglass lenses based on optical design values obtained by the calculation for the optimizing.

2. The eyeglass lens manufacturing method according to claim 1 ,
wherein the relative measurement values include at least one of or both of the positive relative accommodation and the negative relative accommodation.

3. The eyeglass lens manufacturing method according to claim 1 , wherein the relative measurement values include the vertical fusional vergence.

4. The eyeglass lens manufacturing method according to claim 1 , further comprising:
classifying a fusion disabled area and a fusional area as threshold values for the binocular visual acuity functions;
defining a smaller value of visual functions of left and right eyeballs, as the binocular visual acuity function in the fusion disabled area; and
defining a value obtained by subtracting a binocular visual acuity improvement value from the smaller value of the visual functions of the left and right eyeballs, as the binocular visual acuity function in the fusional area.

5. The eyeglass lens manufacturing method according to claim 4 , wherein when a three-dimensional space in which a horizontal axis represents an angle of convergence, a vertical axis represents the vertical fusional vergence of motor fusion and a depth axis represents an accommodation axis is considered for the classifying the fusion disabled area and the fusional area, the classifying the fusion disabled area and the fusional area is executed by using, as criteria, an inside and an outside of a closed surface defined by using the relative measurement values as thresholds.

6. The eyeglass lens manufacturing method according to claim 5 , further comprising:
defining, as a motor fusion threshold, ⅓ of the positive relative convergence or the negative relative convergence of the relative measurement values on the axis of the angle of convergence;
obtaining a convergence aberration defined as a difference between the angle of convergence at the evaluation point and a convergence angle reference value which is the angle of convergence of a fixation line passing through design reference points of the eyeglass lenses;
obtaining a plane parallel component which includes a median line of the fixation line by which the angle of convergence at the evaluation point is obtained and which is a projection to a plane perpendicular to a median plane;
defining, as a judgment criterion of motor fusion of relative convergence, a compared value between a plane parallel component value of the convergence aberration and a motor fusion threshold of the angle of convergence;
defining, as a motor fusion threshold of accommodation, ⅓ of the positive relative accommodation or the negative relative accommodation of the relative measurement values on the accommodation axis;
defining, as a judgment criterion of the motor fusion of relative accommodation, a compared value between an average dioptric error obtained at the evaluation point and the motor fusion threshold of accommodation;
defining, as a motor fusion threshold of vertical fusional vergence, ⅓ of the vertical fusional vergence of the relative measurement values on the axis of the vertical fusional vergence of motor fusion;
obtaining a plane vertical component which includes a median line of the fixation line for which the angle of convergence of the evaluation point is obtained and which is a projection to a plane parallel with the median plane;
defining, as a judgment criterion of motor fusion of vertical fusional vergence, a compared value between a value of the plane vertical component of the convergence aberration and the motor fusion threshold of vertical fusional vergence;
classifying into an inside of a motor fusional area satisfying a criterion of motor fusion when all the judgment criteria of the motor fusions of relative convergence, relative accommodation and vertical fusional vergence are satisfied simultaneously; and
classifying into a motor fusion disabled area when at least one of the judgment criteria of the motor fusions is not satisfied.

7. The eyeglass lens manufacturing method according to claim 5 , further comprising:
defining, as a sensory fusion threshold of the angle of convergence, a plane parallel component perpendicular to a median plane of a Panum's fusional area on the axis of the angle of convergence;
obtaining a convergence aberration defined as a difference between the angle of convergence of the evaluation point and a convergence angle reference value which is the angle of convergence of a fixation line passing through design reference points of the eyeglass lenses;
obtaining, for the convergence aberration, a plane parallel component which includes a median line of the fixation line for which the angle of convergence of the evaluation point is obtained and which is a projection to a plane perpendicular to a median plane;
defining, as a judgment criterion of sensory fusion of relative convergence, a compared value between a plane parallel component value of the convergence aberration and the sensory fusion threshold of the angle of convergence;
defining a focal depth as a sensory fusion threshold of accommodation, on the accommodation axis;
defining, as a judgment criterion of sensory fusion of relative accommodation, a compared value between an average dioptric error at the evaluation point and the sensory fusion threshold of accommodation;
defining, as a sensory fusion threshold of vertical fusional vergence, a plane vertical component parallel with the median plane of the Panum's fusional area on the axis of the vertical fusional vergence of motor fusion;
obtaining, for the convergence aberration, a plane vertical component which includes the median line of the fixation line for which the angle of convergence of the evaluation point is obtained and which is a projection to a plane parallel with the median plane;
defining, as a judgment criterion of sensory fusion of vertical fusional vergence, a compared value between a value of the plane vertical component of the convergence aberration and the sensory fusion threshold of vertical fusional vergence;
classifying inot an inside of a sensory fusional area when all the judgment criteria of the sensory fusions of relative convergence, relative accommodation and vertical fusional vergence are satisfied simultaneously; and
classifying into an inside of a sensory fusion disabled area when at least one of the judgment criteria of the sensory fusions is not satisfied.

8. The eyeglass lens manufacturing method according to claim 1 , wherein each of the evaluation function and the binocular visual acuity function has a following relationships defined by equations (1) and (2):
evaluation function=Σ n i=1 [W i ×( B i −min B )] 2   (1)

where W i represents a weight at an i-th evaluation point of an object represented in a binocular view direction, the weight represents a coefficient which varies depending on impo

Assignees

• Yamakaji Tetsuma
• Hoya Corp

Inventors

• Yamakaji Tetsuma

Classifications

• G02C2202/06

  Special ophthalmologic or optometric aspects · CPC title

• G01M11/0257 Primary

  by analyzing the image formed by the object to be tested · CPC title

• G02C7/027

  considering wearer's parameters · CPC title

• G02C7/061

  Spectacle lenses with progressively varying focal power · CPC title