Method for evaluating an ophthalmic lens; associated evaluation system and industrial assembly for manufacturing an ophthalmic lens

Patent metadata

Field	Value
Publication number	US-2020241320-A1
Application number	US-201816652613-A
Country	US
Kind code	A1
Filing date	Sep 28, 2018
Priority date	Oct 3, 2017
Publication date	Jul 30, 2020
Grant date	—

Abstract

A method for evaluating an ophthalmic lens for a given wearer according to a visual performance parameter includes providing wearer's data for the given wearer. The method further includes providing a visual performance parameter tolerance range for the wearer. The method further includes providing an ophthalmic lens to be evaluated, the ophthalmic lens being characterized by opto-geometrical features. The method further includes computing a value of the visual performance parameter for the lens to be evaluated on the basis of a model. The method further includes evaluating the ophthalmic lens by comparing the computed value of the visual performance parameter with the visual performance parameter tolerance range.

First claim

1 . A method implemented by computer means for evaluating an ophthalmic lens for a given wearer according to a visual performance parameter (VPP), the method comprising the steps of:
step (a) of providing wearer's data for the given wearer, the wearer's data comprising at least prescription data; step (b) of providing, for the visual performance parameter (VPP), a visual performance parameter tolerance range (VPP1; VPP2) for the 10 wearer; step (c) of providing an ophthalmic lens to be evaluated, the ophthalmic lens being characterized by opto-geometrical features; step (d) of determining a value (VPPV) of the visual performance parameter (VPP) for the lens to be evaluated on the basis of a wearer visual performance model, the model being a function of the wearer's data, of the opto-geometrical features of the evaluated lens and of at least a gaze direction of the given wearer; and step (e) of evaluating the ophthalmic lens by comparing the determined value (VPPV) of the visual performance parameter with the visual performance parameter tolerance range (VPP1; VPP2), wherein the method is implemented when performing a quality check of the ophthalmic lens.

2 . The method for evaluating an ophthalmic lens as claimed in claim 1 , wherein the wearer visual performance model is a mathematical model simulating the lens to be evaluated worn by the wearer, the determined value (VPPV) of step (d) being computed on the basis of said mathematical model.

3 . The method for evaluating an ophthalmic lens as claimed in claim 1 , wherein step (c) comprises the sub-steps of providing a lens blank or a semi-finished lens blank, and surfacing the lens blank or the semi-finished lens blank as a function of the prescription data so as to obtain the ophthalmic lens to be evaluated.

4 . The method for evaluating an ophthalmic lens as claimed in claim 1 , wherein step (c) comprises a sub-step of measuring the ophthalmic lens to be evaluated so as to determine the opto-geometrical features relevant for the computing step (d), for example measuring the mean refractive power PPO(α, β) and the module of resulting astigmatism ASR(α, β) of the ophthalmic lens, where (α, β) are gaze directions passing 10 by the center of rotation of the eye (CRE), α being lowering angle in degree and β being an azimuth angle in degree, for example by using an interferometer or a Shack-Hartmann measuring device.

5 . The method for evaluating an ophthalmic lens as claimed in claim 1 , wherein the evaluating step (e) comprises the sub-steps of accepting the ophthalmic lens if the determined value of the visual performance parameter (VPPV) falls within the visual performance parameter tolerance range (VPP1; VPP2), and rejecting the ophthalmic lens if not.

6 . The method for evaluating an ophthalmic lens as claimed in claim 1 , wherein the wearer's data comprise wearing condition data.

7 . The method for evaluating an ophthalmic lens as claimed in claim 1 , wherein the visual performance parameter (VPP) is chosen in the list consisting of: acuity loss, contrast sensitivity loss, and dynamic vision performance loss.

8 . The method for evaluating an ophthalmic lens as claimed in claim 7 , wherein the visual performance parameter (VPP) is acuity loss, defined by acuity loss value ACU(α, β) expressed in logMAR and determined in as-worn conditions of the lens by the wearer, wherein the visual performance parameter tolerance range (VPP1; VPP2) is for example (0; 0.2), for example is (0; 0.1), or for example is (0; 0.05), wherein VPP1 and VPP2 are expressed in logMAR.

9 . The method for evaluating an ophthalmic lens as claimed in claim 1 , wherein step (b) of providing a visual performance parameter tolerance range (VPP1; VPP2) comprises a sub-step of measuring, for example with trial lenses, with an aberrometer or with a phoropter, the visual performance parameter tolerance range (VPP1; VPP2) for the wearer.

10 . The method for evaluating an ophthalmic lens as claimed in claim 1 , wherein the model is personalized for the wearer thanks to measuring his sensitiveness to the visual performance parameter.

11 . A method of evaluating an optical equipment comprising a frame and left and right ophthalmic lenses mounted in said frame for a given wearer, wherein said method comprises a step of evaluating each of the mounted ophthalmic lenses according to the method as claimed in claim 1 .

12 . An industrial assembly for manufacturing an ophthalmic lens adapted to a given wearer, the assembly comprising:
an ordering system defining manufacturing criteria on the basis of wearer's data comprising at least prescription data; a manufacturing system for manufacturing an ophthalmic on the basis of the manufacturing criteria; and the evaluation system for the execution of a method according to claim 1 for evaluating an ophthalmic lens manufactured by the manufacturing system.

13 . A non-transitory computer readable medium having instructions stored therein which, when executed by a processor, causes the processor to perform a method according to claim 1 .

Assignees

• Essilor Int

Inventors

• Bercher Pierre
• Chauveau Jean-Pierre
• Le Saux Gilles
• Fricker Sebastien
• Maurice Sebastien

Classifications

• G02C7/028

  Special mathematical design techniques · CPC title

• G02C7/027 Primary

  considering wearer's parameters · CPC title

• G02C7/061

  Spectacle lenses with progressively varying focal power · CPC title