Method for determining target optical functions

Patent metadata

Field	Value
Publication number	US-9360684-B2
Application number	US-201214000387-A
Country	US
Kind code	B2
Filing date	Feb 17, 2012
Priority date	Feb 18, 2011
Publication date	Jun 7, 2016
Grant date	Jun 7, 2016

Abstract

A method for determining target optical functions for a pair of ophthalmic lenses is provided, the method comprising steps of: generating a first target optical function (OFT 1 ) for a first lens of the pair based at least on data relating to a first eye, generating a second target optical function (OFT 2 ) for a second lens of the pair based at least on data relating to the first eye. This method makes it possible to obtain optical functions having improved symmetry. Thus, when using the target optical functions in an optical optimization method, lenses with improved binocular properties can be obtained. The comfort of the wearer of the pair of lenses is thus improved.

First claim

The invention claimed is:

1. A non-transistory computer-implemented method for determining target optical functions for a pair of ophthalmic lenses comprising a first lens for a first eye and a second lens for a second eye of a wearer of the pair of the ophthalmic lenses, wherein a target optical function is a set of optical criteria values defined for given gaze directions, representing the performance to be reached, the method comprising steps of:
generating a first target optical function for the first lens of the pair of the ophthalmic lenses based at least on data relating to the first eye, wherein said data relating to the first eye are selected from monocular data linked to prescription data for the first eye or a combination of prescription data, data linked to the first eye's biometry and binocular data;
creating an intermediate optical function for the second lens of the pair of the ophthalmic lenses based on a transformation of the first target optical function,
wherein said transformation applies to the values of one optical criterion of the first target optical function, and wherein said transformation is selected from linear transformations such as
shifts, including power shifts, and
homotheties; and

generating a second target optical function for the second lens of the pair of the ophthalmic lenses by modifying the intermediate optical function based on the prescription data of the second eye.

2. The method according to claim 1 , wherein said transformation is a shift.

3. The method according to claim 1 , wherein the generating step of the first target optical function comprises steps of:
creating an intermediate optical function for the first lens of the pair of the ophthalmic lenses based at least on data relating to the first eye; and
determining the first target optical function by modifying the intermediate optical function for the first lens of the pair of the ophthalmic lenses based on the prescription data for the first eye,
wherein the intermediate optical function for the second lens of the pair of the ophthalmic lenses is based on a transformation of the intermediate optical function of the first target optical function.

4. The method according to claim 3 , wherein two gaze directions are associated, one gaze direction relative to the first eye and the other one relative to the second eye are associated to see a given object, and wherein, the intermediate function for the first lens of the pair of the ophthalmic lenses and the intermediate function for the second lens of the pair of the ophthalmic lenses have optical criteria values, the transformation being such that the intermediate optical function optical for the second lens of the pair of ophthalmic lenses has the same optical criteria value of the intermediate optical function for the first lens of the pair of the ophthalmic lenses for each associated gaze direction.

5. The method according to claim 1 , wherein the generating step of the first target optical function is also based on data relating to the second eye.

6. The method according to claim 3 , wherein the step of creating an intermediate optical function for the first lens of the pair of the ophthalmic lenses comprises:
defining two sets of optical criteria values (V 1 first eye , . . . VN first eye , V 1 second eye , VN second eye ), calculated for given gaze directions ((α,β) and (α′,β′)), one set (V 1 first eye , . . . VN first eye ) being defined with data relative to the first eye and one set (V 1 second eye , . . . VN second eye ) being defined with data relative to the second eye;
determining weighting coefficients (γi second eye and γi second eye ) between both eyes for each optical criteria values of the sets of optical criteria based on data relating to both eyes;
calculating a set of optical criteria (Wi first eye ) constituting the intermediate optical function for the first lens of the pair of the ophthalmic lenses by applying an operation to the optical criteria values of the two sets of optical criteria (V 1 first eye , . . . VN first eye , V 1 second eye ,. . . VN second eye ),
wherein the operation is the product of the weighting coefficient by optical criteria for the first eye added to the product of the difference of 1 and the weighting coefficient by the optical criteria for the second eye:
Wi first eye (α,β)=γ i first eye Vi first eye (α,β)+(1 −γi first eye ) Vi second eye (α′,β′).

7. The method according to claim 6 , wherein the weighting coefficients are determined based on monocular data deriving from the prescription for both eyes, or on binocular data.

8. A method of optical optimization of a pair of ophthalmic lenses comprising the steps of:
choosing an initial pair of ophthalmic lenses;
determining target optical functions according to the method of claim 1 ;
defining a current pair of ophthalmic lenses, optical functions being associated to each ophthalmic lens of the pair of current ophthalmic lenses, the current pair of ophthalmic lenses being initially defined as the initial pair of ophthalmic lenses; and
carrying out an optical optimization for minimizing the difference between the current optical functions and the target optical functions with a cost function.

9. A method for manufacturing a pair of ophthalmic lenses, comprising the steps of:
providing data relating to the eyes of the wearer,
determining target optical functions according to the method of claim 1 ,
carrying out an optical optimization based on the target optical functions so as to obtain a pair of optimized ophthalmic lenses; and
manufacturing at least one ophthalmic lens of the pair of ophthalmic lenses according to the result of the optical optimization.

10. A set of apparatuses for manufacturing a pair of ophthalmic lenses, wherein the apparatuses are adapted to carry out the method according to claim 9 .

11. A non-transistory set of data comprising:
data relating to the eyes of the wearer; and
target optical functions determined according to the method of claim 1 .

12. A non-transistory computer program product comprising one or more stored sequence of instructions that is accessible to a processor and which, when executed by the processor, causes the processor to carry out the steps of the method according to claim 1 .

13. A non-transistory computer readable medium carrying out one or more sequences of instructions of the computer program product of claim 12 .

14. An optimized lens obtained by carrying out an optical optimization based on the target optical functions determined by the method according to claim 1 .

15. An optimized pair of ophthalmic lenses obtained by carrying out an optical optimization based on the target optical functions determined by the method according to claim 1 .

16. The method according to claim 1 , wherein said transformation is a power shift.

Assignees

• Contet Aude
• De Rossi Hélène
• Essilor Int

Inventors

• Contet Aude
• De Rossi Hélène

Classifications

• G02C7/028 Primary

  Special mathematical design techniques · CPC title

• G02C7/027

  considering wearer's parameters · CPC title

• G02C7/061

  Spectacle lenses with progressively varying focal power · CPC title

• G02C7/025

  considering parameters of the viewed object · CPC title

• G02C7/06 Primary

  bifocal; multifocal {; progressive (G02C7/041 takes precedence)} · CPC title