METHOD FOR EVALUATING EYEGLASS LENS, METHOD FOR DESIGNING EYEGLASS LENS, METHOD FOR MANUFACTURING EYEGLASS LENS, MANUFACTURING SYSTEM FOR EYEGLASS LENS, AND EYEGLASS LENS

• US 20130179297A1
• Filed: 01/24/2013
• Published: 07/11/2013
• Est. Priority Date: 07/27/2010
• Status: Abandoned Application

• Current Assignee: Hoya Corporation
• Original Assignee: Hoya Corporation
• Inventors: YAMAKAJI, Tetsuma
• Application Number:
  US13/749,169
• Publication Number:
  US 20130179297A1
• Time in Patent Office: Days
• US Class Current: 705/26.5
• CPC Class Codes: G02C 2202/06 Special ophthalmologic or optometric aspects
• CPC Class Codes: G02C 7/025 considering parameters of the viewed object
• CPC Class Codes: G02C 7/027 considering wearer's parameters
• CPC Class Codes: G02C 7/061 Spectacle lenses with progressively varying focal power

Abstract

For evaluating custom made eyeglass lenses using a visual fatigue function, the visual fatigue function includes at least one of or both of a positive relative convergence and 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.

Claims

1. A method for designing eyeglass lenses,

wherein when a positive relative convergence, a negative relative convergence, a positive relative accommodation, a negative relative accommodation and a vertical fusional vergence, which are individual measurement values relating to binocular vision, are defined as relative measurement values, at least one of or both of the positive relative convergence and the negative relative convergence is included in an individual relative measurement value, the method comprising:

determining optical design values for eyeglass lenses by optimizing binocular vision while using, as an evaluation function for the optimizing, a function obtained by adding visual fatigue functions including the relative measurement values as factors at respective evaluation points of an object.

2. The method for designing eyeglass lenses according to claim 1, wherein the relative measurement value includes at least one of or both of the positive relative accommodation and the negative relative accommodation.

3. The method for designing eyeglass lenses according to claim 1, wherein the relative measurement value includes the vertical fusional vergence.

4. The method for designing eyeglass lenses according to claim 1,

wherein, when considering a three-dimensional space whose horizontal axis, vertical axis and depth are respectively defined as an angle of convergence, the vertical fusional vergence of the motor fusion, and accommodation, for classification into a comfortable area and a visual fatigue area with reference to ⅓

of the relative measurement value as a threshold value of the visual fatigue function including the relative measurement value as a factor, the classification into the comfortable area and the visual fatigue function is made with reference to whether it is inside or outside of a first closed surface whose threshold is ⅓

of the relative measurement value.

5. The method for designing eyeglass lenses according to claim 4,

wherein, when considering a three-dimensional space whose horizontal axis, vertical axis and depth are respectively defined as the angle of convergence, the vertical fusional vergence of the motor fusion and the accommodation, for further classifying the comfortable area into the sensory fusion area and the motor comfortable area excepting the sensory fusion area, the classification into the sensory fusion area and the motor comfortable area is made with reference to whether it is inside or outside of a second closed surface whose threshold values are ½

of a horizontal component, ½

of a vertical component and ½

of a focal depth of Panum'"'"'s fusional area.

6. The method for designing eyeglass lenses according to claim 5, further comprising:

defining ⅓

of the positive relative convergence or the negative relative convergence of the relative measurement values as a threshold value of the motor comfortable area of the angle of convergence along an axis of the angle of convergence;

determining a convergence aberration defined as a difference between the angle of convergence at an evaluation point and a convergence angle reference value which is the angle of convergence of lines of fixation passing through reference points of the eyeglass lenses;

for the convergence aberration, determining a plane parallel component which is a projected component to a plane which is perpendicular to a median plane and includes a median line of the lines of fixation for which the angle of convergence of the evaluation point is obtained;

defining, as a judgment criterion of the motor comfortable area of the relative convergence, a difference between a value of the plane parallel component of the convergence aberration and a threshold value of the motor comfortable area of the angle of convergence;

defining ⅓

of the positive relative accommodation or the negative relative accommodation of the relative measurement values as a threshold value of the motor comfortable area of the accommodation, along the axis of the accommodation;

defining, a judgment criterion of the motor comfortable area of the relative accommodation, a difference between an average error in power obtained at the evaluation point and a threshold value of the motor comfortable area of the accommodation;

defining ⅓

of the vertical fusional vergence of the relative measurement values as a threshold value of the motor comfortable area of the vertical fusional area, along an axis of the vertical fusional vergence of the motor fusion;

for the convergence aberration, determining a plane perpendicular component which is a projected component to a plane which is parallel with the median plane and includes a median line of the lines of fixation for which the angle of convergence at the evaluation point is obtained;

defining, as a judgment criterion of the motor comfortable area of the vertical fusional vergence, a difference between a value of the plane perpendicular component of the convergence aberration and the motor comfortable area of the vertical fusional vergence;

when COMH, COMV, COMR, COML and COMD represent coefficient with respect to the convergence aberration, the error in power represents a coefficient with respect to the relative measurement value, AREA1 defines the inside or the outside of the first closed surface, and it is classified as the comfortable area when AREA1 is smaller than 1, and it is classified as the visual fatigue area when AREA1 is larger than 1, (where,

COMH defined when the horizontal component of the convergence aberration is positive is;

COMH=plane parallel component of the convergence aberration/(⅓

of the negative relative convergence),

COME defined when the horizontal component of the convergence aberration is negative is;

COMH=plane parallel component of the convergence aberration/(⅓

of the positive relative convergence),

COMV=plane perpendicular component of the convergence aberration/(⅓

of the vertical fusional vergence)

COMR defined when the error in power is positive is;

COMR=error in power of the right eye/(⅓

of the negative relative accommodation)

COMR defined when the error in power is negative is;

COMR=error in power of the right eye/(⅓

of the positive relative accommodation)

COML defined when the error in power is positive is;

COML=error in power of the left eye/(⅓

of the negative relative accommodation)

COML defined when the error in power is negative is;

COML=error in power of the left eye/(⅓

of the positive relative accommodation)

COMD=larger one of COMR and COML

AREA1=root of sum of squares having COMH, COMV, COMD as factors.

7. The method for designing eyeglass lenses according to claim 5, further comprising:

defining ½

of the plane parallel component which is perpendicular to the median plane of Panum'"'"'s fusional area as a sensory fusion threshold value of the angle of convergence;

determining the convergence aberration defined as a difference between the angle of convergence at the evaluation point and the convergence angle reference value which is the angle of convergence of the lines of fixation passing through the reference points of the eyeglass lenses;

for the convergence aberration, determining the plane parallel component which is projected component to the plane which is perpendicular to the median plane and includes the lines of fixation for which the angle of convergence at the evaluation point is obtained;

defining, as a judgment criterion of the sensory fusion of the relative convergence, a difference between a value of the plane parallel component of the convergence aberration and the sensory fusion threshold value of the angle of convergence;

defining ½

of the focal depth as the sensory fusion threshold value of the accommodation, along an axis of the accommodation;

defining, as a judgment criterion of the sensory fusion of the relative accommodation, a difference between an average error in power at the evaluation point and the sensory fusion threshold value of the accommodation;

defining, as the sensory fusion threshold value of the vertical fusional vergence, ½

of the plane perpendicular component which is parallel with the median plane of Panum'"'"'s fusional area, along the axis of the vertical fusional vergence of the motor fusion;

for the convergence aberration, determining the plane perpendicular component which is a projected component to a plane which is parallel with the median plane and includes a median line of the lines of fixation for which the angle of convergence at the evaluation point is obtained;

defined, as a judgment criterion of the sensory fusion of the vertical fusional vergence, a difference between a value of the plane perpendicular component of the convergence aberration and the sensory fusinal threshold value of the vertical fusional vergence;

when SENH, SENV, SENR, SENL and SEND represent coefficients with respect to the convergence aberration, the error in power represents a coefficient with respect to the relative measurement value, AREA2 defines the inside or the outside of the second closed surface, it is classified as the sensory fusion area when AREA2 is smaller than 1, and, it is classified as the motor comfortable area when AREA2 is larger than 1 and is not the visual fatigue area, (where SENH=plane parallel component of the convergence aberration/PanumH

SENV=plane perpendicular component of the convergence aberration/Panum V

SENR=absolute value of (error in power of the right eye/PanumD)

SENL=absolute value of (error in power of the left eye/Panum D)

SEND=larger one of SENR and SENL

AREA2=root of sum of squares having SENH, SENV and SEND as factors

PanumH, PanumV and PanumD respectively represent ½

of the horizontal component, ½

of the vertical component and ½

of the focal depth of the Panum'"'"'s fusional area at the central fovea).

8. The method for designing eyeglass lenses according to claim 1,

wherein the evaluation function and the visual fatigue function have a relationship defined by a following equation (1):

9. An eyeglass lens evaluation method, comprising:

when a positive relative convergence, a negative relative convergence, a positive relative accommodation, a negative relative accommodation and a vertical fusional vergence, which are individual measurement values related to a binocular vision of a wearer of eyeglass, are defined as relative measurement values, measuring at least one of or both of the positive relative convergence and the negative relative convergence as the relative measurement value; and

optimizing binocular vision while using, as an evaluation function for calculation of the optimizing, a function obtained by adding visual fatigue functions including the relative measurement values as factors at respective evaluation points.

10. An eyeglass lens manufacturing method, comprising:

when a positive relative convergence, a negative relative convergence, a positive relative accommodation, a negative relative accommodation and a vertical fusional vergence, which are individual measurement values related to binocular vision of a wearer of eyeglass, are defined as relative measurement values, using at least one of or both of the positive relative convergence and the negative relative convergence as the relative measurement value; and

optimizing the binocular vision while using, as an evaluation function for calculation of the optimizing, a function obtained by adding visual fatigue functions including the relative measurement values as factors at respective evaluation points.

manufacturing eyeglass lenses based on optical design values obtained by the calculation for the optimizing.

11. An eyeglass lens manufacturing system in which an ordering side computer having a function of executing a process for ordering the eyeglass and is installed on an eyeglass lens ordering side, a manufacturing side computer having a function of receiving information from the ordering side computer and executing a process necessary for receiving an order for the eyeglass lens are connected via a network,

wherein the ordering side computer transmits information necessary for designing the eyeglass lenses including at least one of or both of a positive relative convergence and a negative relative convergence, to the manufacturing side computer;

wherein the manufacturing side computer includes;

a data input unit to which data including the relative measurement value transmitted from the ordering side computer is inputted;

a visual fatigue function calculation unit that calculates optical performance values at a plurality of evaluation points of the eyeglass lenses based on the inputted data;

an evaluation value optimization unit that optimizes the optical performance values by using, as an evaluation function, a function obtained by adding visual fatigue functions including, as factors, the relative measurement values including at least one of or both of the positive relative convergence and the negative relative convergence;

an evaluation function evaluating unit that evaluates the optical performance values by comparing the evaluation function with a predetermined threshold;

a design data correction unit that corrects design data when the values of the visual fatigue functions do not reach a predetermined convergence condition as a result of the evaluation by the evaluation value evaluating unit;

an optical design value determination unit that determines the design data based on a result of evaluation finished for each evaluation point by the evaluation function evaluating unit; and

a design data output unit that supplies the final design data obtained by the optical design value determination unit, to a device for processing a lens.

12. Eyeglass lenses manufactured by executing the steps of:

when a positive relative convergence, a negative relative convergence, a positive relative accommodation, a negative relative accommodation and a vertical fusional vergence, which are individual measurement values related to binocular vision of a wearer of eyeglass, are defined as relative measurement values, providing a relative measurement value including at least one of or both of the positive relative convergence and the negative relative convergence; and

executing optimization while using an evaluation function obtained by adding visual fatigue functions including the relative measurement values as factors at respective evaluation points; and

manufacturing the eyeglass lenses based on optical design values obtained by calculation of the optimizing.