Ocular optical system simulation apparatus

• US 5,875,017 A
• Filed: 05/30/1997
• Issued: 02/23/1999
• Est. Priority Date: 05/31/1996
• Status: Expired due to Term

• Current Assignee: Hoya Corporation
• Original Assignee: Hoya Corporation
• Inventors: Ohnuma, Kazuhiko, Qi, Hua, Minato, Atsuo
• Primary Examiner(s): MANUEL, GEORGE C
• Application Number:
  US08/866,159
• Time in Patent Office: 634 Days
• Field of Search: 351/200, 351/204, 351/205, 351/216, 351/246, 623/6
• US Class Current: 351/205
• CPC Class Codes: A61B 3/0025 characterised by electronic signal processing, e.g. eye models
• CPC Class Codes: G02C 7/02 Lenses; Lens systems ; Methods of designing lenses

Abstract

An apparatus for simulating a retinal image obtained when a lens is used with a human eye. The apparatus can simulate intraocular lenses, contact lenses or eyeglass lenses. When intraocular lenses are simulated, a lens system 31 comprises photographic lenses and an intraocular lens mounting section. The intraocular lens is held within one or more liquid containing sections provided in the intraocular lens mounting section. The relative position of the photographic lenses and the intraocular lens is set by making the paraxial object point distance of a front refracting face of the intraocular lens substantially equal that calculated when the intraocular lens replaces a crystalline lens of Glustrand'"'"'s ocular model. When simulating contact or eyeglass lenses, a front face of a lens disposed nearest the object in lens system 31 has substantially the same radius of curvature as that of a human cornea, and a contact lens supporting base has a shape corresponding to the conjunctiva of the eye. An image of the object 30 formed by the lens system 31 thus designed is captured by a CCD camera 32 and the image is then displayed on a display unit 33.

Claims

1. An apparatus for simulating a retinal image when a lens is used with a human eye, comprising:

a lens system having a model eye lens subsystem and a simulated lens; and

an image pickup for picking up an image of an object focused by said lens system.

2. An apparatus according to claim 1, wherein said simulated lens is an intraocular lens, and wherein said lens system further comprises:

an intraocular lens support for supporting the intraocular lens; and

a compound lens member optically connected to the intraocular lens support, whereby the compound lens and intraocular lens support are constructed so that said image substantially reproduces a retinal image obtained when the intraocular lens had been implanted in a human eye.

3. An apparatus according to claim 2, wherein said compound lens member is a wide angle lens.

4. An apparatus according to claim 3, wherein said wide angle lens is disposed between said object and said intraocular lens support.

5. The apparatus according to claim 2, wherein said intraocular lens supporting means comprises a liquid containing section and said intraocular lens is supported in liquid disposed in the liquid containing section.

6. An apparatus according to claim 2, further comprising a display connected to said image pickup for displaying said image.

7. An apparatus according to claim 2, wherein said simulated intraocular lens has a front face facing said object with a paraxial object point distance substantially equal to a paraxial object point distance of a front face of said intraocular lens when implanted in a human eye.

8. An apparatus according to claim 2, wherein the simulated interocular lens has a front face facing said object with a paraxial object point distance substantially equal to a paraxial object point distance of an intraocular lens of equal diopter used to replace a crystalline lens in Glustrand'"'"'s ocular model.

9. An apparatus according to claim 2, wherein said image pickup comprises a charge coupled device camera.

10. An apparatus according to claim 1, wherein said simulated lens is a simulated contact lens;

and wherein the model eye subsystem comprises a simulated cornea lens having a first surface disposed at a position nearest to said object in said model eye lens subsystem, wherein the first surface has a radius of curvature substantially corresponding to a radius of curvature of the cornea of a human eye.

11. An apparatus according to claim 10, wherein a liquid is disposed between said first surface of said simulated cornea lens and said simulated contact lens, thereby supporting said contact lens.

12. An apparatus according to claim 10, further comprising a contact lens support base provided outside of an outer periphery of said simulated cornea lens, and a liquid provided between said contact lens support base and said simulated contact lens to support said contact lens.

13. An apparatus according to claim 12, wherein at least a part of said contact lens support base has a shape corresponding to a conjunctiva of a human eye.

14. An apparatus according to claim 10, further comprising a display connected to said image pickup for displaying said image.

15. An apparatus according to claim 10, wherein said image pickup comprises a charge coupled device camera.

16. An apparatus according to claim 1, wherein said simulated lens is an eyeglass lens, and further comprising a support for supporting said eyeglass lens at a predetermined position with respect to said model eye lens subsystem.