OPHTHALMIC LENS DISPENSING METHOD AND SYSTEM

• US 20100026955A1
• Filed: 10/26/2007
• Published: 02/04/2010
• Est. Priority Date: 10/26/2006
• Status: Active Grant

• Current Assignee: Carl Zeiss Vision Incorporated (Carl-Zeiss-Stiftung)
• Original Assignee: Carl Zeiss Vision Incorporated (Carl-Zeiss-Stiftung)
• Inventors: Fisher, Scott Warren, Stockman, Kym Ansley, Stephenson, Philip Charles Lachlan
• Granted Patent: US 9,164,299 B2
• Time in Patent Office: Days
• US Class Current: 351/205
• CPC Class Codes: A61B 5/0064 Body surface scanning
• CPC Class Codes: G02C 13/003 Measuring during assembly or fitting of spectacles

Abstract

A method (100) of dispensing an ophthalmic lens for a wearer is disclosed. The method (100) includes measuring (104) the relative location of, and/or relationship between, selected anatomical features of a wearer'"'"'s head or face to obtain one or more measurement values and processing (106) the one or more measurement values to design and/or select an ophthalmic lens having a shape that depends on the measured values. The ophthalmic lens element is then dispensed to the wearer. A dispensing system (200) is also disclosed.

Claims

1. A method of dispensing an ophthalmic lens for a wearer, the method including:

measuring the relative location of, and/or relationship between, selected anatomical features of a wearer'"'"'s head or face to obtain one or more measurement values; and

processing the one or more measurement values to design and/or select an ophthalmic lens having a shape that depends on the measured values; and

dispensing the ophthalmic lens to the wearer.

2. A method according to claim 1 wherein the shape of the ophthalmic lens substantially conforms to contours of head or facial features of the wearer.

3. A method according to claim 1 wherein the anatomical features of the wearer'"'"'s head or face are selected to provide measurement values that approximate a contour of a frontal aspect of the wearer'"'"'s head or face.

4. A method according to claim 3 wherein the contour lies in a substantially vertical plane intersecting the selected anatomical features.

5. A method according to claim 3 wherein the contour lies in a substantially horizontal plane intersecting the selected anatomical features.

6. A method according to claim 1 wherein the shape is a front surface shape of the ophthalmic lens.

7. A method according to claim 1 wherein the ophthalmic lens includes a front surface having a surface shape that depends on the measurement values for the relative location of, and/or the relationship between, selected anatomical features of a wearer'"'"'s head and/or face, and a back surface includes a central zone having a surface shape that corrects optical aberrations introduced by the front surface shape.

8. A method according to claim 1 wherein measuring the location of, and/or relationship between, the selected anatomical features of the wearer'"'"'s head or face to obtain one or more measurement values includes:

obtaining scan data derived from a three-dimensional scan of the wearer'"'"'s head or face; and

processing the scan data to obtain a measurement value for each of the selected anatomical features.

9. A method according to claim 1 wherein the anatomical features of the wearer'"'"'s head are selected from the zygion, the zygomatic arch, the frontal eminence, the temporomandibular joint and the mandible angle.

10. A method according to claim 1 wherein the anatomical features of the wearer'"'"'s face include anatomical features of the wearer'"'"'s eye and/or eyelids.

11. A method according to claim 10 wherein the anatomical features of the wearer'"'"'s eye and/or eyelids are selected from the pupil, the medial angle, the lateral angle, the medial commissure, the lateral commissure, the medial canthus, the lateral canthus, the lacarimal caruncle, the nasojugal fold, the lower eyelid margin, and the palperal fissure.

12. A method according to claim 1 wherein selecting an ophthalmic lens having a surface shape that depends on the measured values includes selecting an ophthalmic lens from an array of ophthalmic lenses having a predefined relationship with a range of values for the anatomical features.

13. A method according to any one of claim 1 wherein designing an ophthalmic lens having a shape that depends on the measured values includes defining a surface geometry based on the measured values.

14. A method according to claim 1 wherein designing an ophthalmic lens having a surface shape depending on the measured values includes designing an ophthalmic lens having a single base curve that depends on the measured values.

15. A method according to claim 1 further including modifying the surface shape of the designed ophthalmic lens according to blur and/or prism conditions.

16. A method according to claim 15 wherein modification of the surface shape of the designed ophthalmic lens minimises blur across a central viewing zone of the ophthalmic lens while controlling ray-traced prism in peripheral areas of the lens.

17. A method according to claim 1 wherein the method further includes querying the wearer to obtain wearer information describing the intended purpose and/or functional requirements of the ophthalmic lens, and processing that information, together with the measurement values, to dispense an ophthalmic lens having a surface shape that depends on the measured values and the wearer information.

18. A method according to claim 17 wherein processing the wearer information and the measurement values dispenses an ophthalmic lens having a parameter that has been optimised within the constraints of the measured values, the optimised parameter being associated with the intended purpose and/or function of the ophthalmic lens.

19. A method according to claim 18 wherein the optimised parameter is selected from:

a. aerodynamic coefficient of drag;

b. splash protection;

c. glare protection;

or

d. field of view.

20. A method according to claim 19 wherein the optimised parameters are optimised for a specific application of the ophthalmic lenses.

21. A system for dispensing an ophthalmic lens for a wearer, the system including:

a measuring apparatus for measuring the relative location of, and/or relationship between, selected anatomical features of a wearer'"'"'s head or face to obtain one or more measurement values; and

a processing device for processing the one or more measurement values to dispense the ophthalmic lens, the dispensing including selecting or designing an ophthalmic lens having a shape that depends on the one or more measured values.

22. A system according to claim 21 wherein measuring apparatus includes a three dimensional scanning device for providing a three-dimensional scan for the wearer'"'"'s head or face.

23. A system according to claim 21 further including a database storing an array of ophthalmic lenses having a predefined relationship with a range of values for the anatomical features.

24. A programmed computer for dispensing an ophthalmic lens for dispensing to a wearer, the computer including:

a processing device;

a memory; and

a set of program instructions resident in the memory and executable by the processor to accept one or more measurement values expressing the relative location of, and/or the relationship between, selected anatomical features of a wearer'"'"'s head or face and to process the measurement values to design and/or select an ophthalmic lens for dispensing, the ophthalmic lens having a shape that depends on the measured values.

25. An integrated scanning and processing system for selecting and/or designing an ophthalmic lens for dispensing to a wearer, the system including:

a scanning device for scanning the wearer'"'"'s head or face to provide three-dimensional scan data;

an input device for inputting or selecting anatomical features of the wearer'"'"'s face or head; and

a processing device for obtaining, from the three-dimensional scan data, one or more measurement values expressing the relative location of, and/or the relationship between, the anatomical features and to process the measurement values to design and/or select an ophthalmic lens for dispensing, the ophthalmic lens having a shape that depends on the measured values.

26. A computer readable media storing a set of program instructions that are executable by a computer processor to accept one or more measurement values expressing the relative location of, and/or the relationship between, selected anatomical features of a wearer'"'"'s head or face;

and to process the one or more measurement values to select and/or design, for dispensing, an ophthalmic lens having a shape that depends on the measured values.

27. (canceled)

28. (canceled)