Claims
- 1. A method for providing a contact lens for a patient comprising:
- locating an optical feature on a patient's eye;
- selecting an optical preform;
- determining a resting position of said optical preform when said optical preform is stabilized on the patient's eye to locate a reference position on the surface of the optical preform coincident with the optical feature on the patients eye; and
- machining an optical modification on said optical preform at a location based on the reference position on the optical preform.
- 2. The method of claim 1, wherein said contact lens is a single vision contact lens with a multifocal add power zone.
- 3. The method of claim 1, wherein said contact lens is a single vision lens with a toric zone.
- 4. The method of claim 1, wherein said contact lens is a toric or astigmatic lens with a multifocal add power zone.
- 5. The method of claim 1, wherein a mass is machined from the optical preform to stabilize the optical preform against rotation.
- 6. The method of claim 1, wherein said optical feature is the center of the pupil of the patient's eye.
- 7. The method of claim 1, wherein said optical feature is the line of sight of the patient's eye.
- 8. The method of claim 1, wherein said step of determining the rest position of the optical preform comprises:
- fitting a patient with an optical preform; and
- observing the position on the surface of the optical preform corresponding to the optical feature.
- 9. The method of claim 1, wherein said step of determining a rest position of the optical preform is determined without a fitting a trial lens on the patient's eye.
- 10. The method of claim 1, wherein the convex side of the optical preform is machined.
- 11. The method of claim 1, wherein the concave side of the optical preform is machined.
- 12. A contact lens having an optical modification provided by machining, said optical modification being located based on a position of an optical feature on the patients eye relative to the contact lens when the lens is stabilized on the patient's eye.
- 13. The contact lens of claim 12, wherein said contact lens is single vision contact lens with a multifocal add power zone.
- 14. The contact lens of claim 12, wherein said contact lens is a single vision lens with a toric zone.
- 15. The contact lens of claim 12, wherein said contact lens is a toric or astigmatic lens with a multifocal add power zone.
- 16. The contact lens of claim 12, wherein a stabilizing feature has been machined into the contact lens.
- 17. The method of claim 12, wherein said optical feature is machined on the convex side of the contact lens.
- 18. The method of claim 12, wherein said optical feature is machined on the concave side of the contact lens.
- 19. The contact lens of claim 12, wherein said optical feature is the center of the pupil of the patient's eye.
- 20. The contact lens of claim 12, wherein said optical feature is the line of sight of the patient's eye.
Parent Case Info
This application is a continuation-in-part of Ser. No. 225,386, Apr. 8, 1994, U.S. Pat. No. 5,517,259, which is a continuation-in-part of Ser. No. 216,381, Mar. 23, 1994, U.S. Pat. No. 5,592,234 which is a continuation-in-part of Ser. No. 980,053, Nov. 23, 1992, U.S. Pat. No. 5,406,341.
US Referenced Citations (14)
Foreign Referenced Citations (1)
Number |
Date |
Country |
WO9412909 |
Jun 1994 |
WOX |
Non-Patent Literature Citations (1)
Entry |
Kendall, C.A., "Ultrafocal.RTM. Bifocal Contact Lens", Contacto , Jan. 1976, pp. 31-36. |
Continuation in Parts (3)
|
Number |
Date |
Country |
Parent |
225386 |
Apr 1994 |
|
Parent |
216381 |
Mar 1994 |
|
Parent |
980053 |
Nov 1992 |
|