METHOD FOR OPTIMIZING AND/OR MANUFACTURING EYEGLASS LENSES

• US 20090219486A1
• Filed: 05/24/2007
• Published: 09/03/2009
• Est. Priority Date: 05/29/2006
• Status: Active Grant

• Current Assignee: Essilor International SA
• Original Assignee: Essilor International SA
• Inventors: Marin, Gildas, Bonnin, Thierry, Hernandez, Martha, Froeliger, Marie-Gaelle
• Granted Patent: US 8,118,427 B2
• Time in Patent Office: Days
• US Class Current: 351/237
• CPC Class Codes: A61B 3/0041 characterised by display arrangements
• CPC Class Codes: A61B 3/032 Devices for presenting test symbols or characters, e.g. test chart projectors A61B3/036 takes precedence
• CPC Class Codes: G02B 2027/0134 of stereoscopic type
• CPC Class Codes: G02B 2027/0178 Eyeglass type eyeglass details G02C
• CPC Class Codes: G02B 2027/0187 slaved to motion of at least a part of the body of the user, e.g. head, eye
• CPC Class Codes: G02B 26/0825 the reflecting element being a flexible sheet or membrane, e.g. for varying the focus flexible mirrors for cosmetic use A45D42/24
• CPC Class Codes: G02B 27/0172 characterised by optical features
• CPC Class Codes: G02B 5/30 Polarising elements light-modulating devices with active elements G02F1/00
• CPC Class Codes: G02C 7/02 Lenses; Lens systems ; Methods of designing lenses
• 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

A method for determining an optimal eyeglass lenses design for a viewer (1) comprising the successive steps of: showing the viewer (1) a stereoscopic scene including optical effects of a first lens design;—introducing a relative movement between the viewer (1) and the shown stereoscopic scene, said scene being shown with optical effects of the first lens design; expressing the viewer'"'"'s opinion; showing the viewer (1) a stereoscopic scene including optical effects of a modified lens design; introducing a relative movement between the viewer (1) and the shown stereoscopic scene, said scene being shown with the modified lens optical effects; expressing again the viewer'"'"'s opinion; repeating the three last steps up to viewer'"'"'s satisfaction. A system for customizing vision correction suitable to implement said method. Related computer program for dynamically calculating a stereoscopic image. Related computer program for actuating an electro-active component.

Claims

1. A method for determining an optimal eyeglass lenses design for a viewer comprising the successive steps of:

showing the viewer a stereoscopic scene including optical effects of a first lens design;

introducing a relative movement between the viewer and the shown stereoscopic scene, said scene being shown with optical effects of the first lens design;

expressing the viewer'"'"'s opinion;

showing the viewer a stereoscopic scene including optical effects of a modified lens design;

introducing a relative movement between the viewer and the shown stereoscopic scene, said scene being shown with the modified lens optical effects;

expressing again the viewer'"'"'s opinion;

repeating the three last steps up to viewer'"'"'s satisfaction.

2. The method of claim 1 where the viewer'"'"'s head position is determined and where the stereoscopic scene is a stereoscopic projected image calculated as a result of the lens design and the viewer'"'"'s head position.

3. The method of claim 2 where the viewer'"'"'s head position determination and the projection of calculated stereoscopic scene are dynamic.

4. The method of claim 2 where the stereoscopic scene is calculated by means of an operating unit comprising a lens design data base.

5. The method of claim 2 where the stereoscopic scene is calculated by means of an operating unit comprising an optical effect data base.

6. The method of claim 3 in combination with claim 5 where the optical effect data base is used to approximate the dynamically projected stereoscopic scene.

7. The method of claim 6 where the approximation to calculate the stereoscopic scene is based on distortion estimation calculated in a given plan independently of the actual distance of the object of the scene, using for example ray tracing.

8. The method of claim 1 where the stereoscopic scene is an actual scene observed by the viewer through a device comprising an electro-active or opto-active component suitable to reproduce the optical effect of a given lens design.

9. The method of claim 8 where the electro-active component is a deformable mirror.

10. The method of claim 9 where the incident beam is firstly reflected on a plane mirror and directed to the deformable mirror on which it is reflected and directed to the viewer'"'"'s eyes.

11. The method of claim 9 where the incident beam is firstly polarised, then reflected on a semi-reflective mirror and directed to the deformable mirror, then directed through the semi-reflective mirror to a plan mirror and then directed to the viewer'"'"'s eyes after being reflected on the semi-reflective mirror.

12. The method of claim 9 where the deformable mirror is a piezoelectric deformable mirror.

13. The method of claim 8 where the electro-active or opto-active component is a liquid crystal spatial light modulator, which can be addressed electrically or optically respectively.

14. The method of claim 13 where the spatial light modulator is an electrically addressed liquid crystal SLM and is mounted so that the incident beam be transmitted.

15. The method of claim 1 where the initial lens design is determined using standard vision correction measurement of the viewer.

16. The method of claim 1 where a number of vision parameters are selected and test sequences are performed parameter by parameter, the viewer'"'"'s opinion being expressed during each sequence corresponding to each parameter.

17. The method according to claim 1 where the influence of a vision parameter choice is tested on previous determined vision parameters, and if the result is unsatisfactory, a new test sequence is performed with previous determined vision parameters up to viewer'"'"'s satisfaction.

18. The method according to claim 16, where vision parameters are chosen from the list constituted of:

progression length, near vision inset, eye/head coefficient, curvature of the lens.

19. The method of claim 1 comprising further the step of transmitting data corresponding to optimal lenses design to a manufacturing unit.

20. The method of claim 19 where the manufacturing unit is a lens printer, such as an ultraviolet engraving system or a direct machining tool.

37. A computer program for dynamically calculating a stereoscopic scene where input parameters are:

viewer'"'"'s head position parameters

viewer'"'"'s satisfaction parameters

lens design data base that includes the surface characteristics and corresponding dioptric power of several model lens designs,

and is configured to receive the measured head position of a viewer and data of a lens design so as to calculate its optical effect and to apply a metric so as to calculate a stereoscopic scene corresponding to the image seen by the viewer in the determined position to perform the steps of the method as claimed in claim 1.

38. A computer program for actuating an electro-active component where input parameters comprise:

viewer'"'"'s satisfaction opinion,

lens design data base that includes the surface characteristics and corresponding dioptric power of several model lens designs,

and is configured to receive the measured head position of a viewer and data of a lens design so as to calculate its optical effect and to apply a metric so as to calculate a stereoscopic scene corresponding to the image seen by the viewer in the determined position to perform the steps of the method as claimed in claim 1.

21. A system for customizing vision correction of eyeglass lenses comprising means to show a stereoscopic scene including optical effects of a lens design to a viewer, said means being suitable to show the stereoscopic scene in different head positions of the viewer, which comprises:

a measurement system configured to determine viewer'"'"'s head position;

a lens design data base that includes the surface characteristics and corresponding dioptric power of several model lens designs;

a calculation system configured to receive the measured head position and data of a length design so as to calculate its optical effect, which is the optical distortions due to said lens design, and to apply a metric so as to calculate a stereoscopic scene corresponding to the image seen by the patient in the determined position and where said calculation system is fed by a lens design data base;

a projecting system of said calculated stereoscopic image to the viewer'"'"'s eyes onto a stereoscopic scene.

22. The system of claim 21 where the data of the lens design comprises optical distortion data.

23. The system of claim 21 where the data further comprises a set of parameters related to the given lens.

24. The system of claim 21 where the measurement system comprises a head movement tracker.

25. The system of claim 24 where said head movement tracker is intended to be placed on the top of the head of the viewer.

26. The system of claim 21 where the calculation system is further configured to apply the metric using distortion approximation calculation in a given plan independently of the actual distance of the object of the scene.

27. The system of claim 21 where the projecting system of the stereoscopic image includes a projector and a screen.

28. The system of claim 27 where the screen is a three part screen with 120°

field of view.

29. The system of claim 21 where the projecting system of the stereoscopic images includes a stereoscopic head mounted display.

30. The system of claim 21 where means to show a stereoscopic scene include an electro-active component suitable to reproduce the optical effect of a given lens design.

31. The system of claim 30 where the electro-active component is a deformable mirror, for example a piezoelectric deformable mirror.

32. The system of claim 30 where the electro-active component is spatial light modulator.

33. The system of claim 21 further comprising a selection system activated by the viewer to feed back his opinion.

34. The system of claim 33 where the system is further configured to choose a new set of parameters of a lens as a function of response of the selection system when activated by the patient'"'"'s feedback.

35. The system of claim 21 further comprising a fabrication system configured to produce correcting eyeglass lenses based on lenses parameters including the result of the feedback of the viewer.

36. The system of claim 35 where the fabrication system includes a lens printer, such as an ultraviolet engraving system or a direct machining tool.