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US5050981A
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Lens design method and resulting aspheric lens
Assignee: Johnson and Johnson Vision Care Inc
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Filing: 1990-07-24
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Granted: 1991-09-24
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Expires: 2010-07-24
Abstract
Abstract An aspheric lens for providing improved vision and a method for generating such a lens is described. The lens provides a sharp image focus while minimizing image aberrations. The method utilizes ray tracing techniques in conjunction with Modulation Transfer functions to accurately account for the total corrective lens-eye system. The lens may be in the form of a contact lens, an intraocular lens, a natural lens or a spectacle lens, and is suitable for correcting myopia, presbyopia, astigmatism and other focusing problems. The lens is characterized by a hyperbolic or parabolic surface which functions to reduce spherical aberrations and minimize the retinal image spot size.
Inventors
- 👤 Jeffrey H. Roffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:36
CPC Classifications
G; G02; G02B; G02B3/00; G02C; G02C7/00; G02C7/02; G02C7/024; G02C7/028; G02C7/04; A; A61; A61F; A61F2/00; A61F2/02; A61F2/14; A61F2/16; A61F2/1613; A61F2/1637; A61F2240/00; A61F2240/001; A61F2240/002
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
142 words
A method of constructing a lens for focusing light on the retina of the eye comprising the steps of: a) constructing a Fourier Transform function model that generates modulation transfer frequencies for the human eye and a preliminary lens, said lens having at least one rotationally symmetric surface defined by the equation: ##EQU4## where X is the aspheric surface point at position Y, r is the central radius, and κ is commonly used aspheric constant, wherein the value of κ is less than or equal to -1, b) performing an analysis using the model so constructed to trace light ray paths through the lens-eye system, c) varying the value of the aspheric constant, κ, for the preliminary lens to achieve a lens-eye system with a trace of light ray paths optimized for sharpest focus by minimizing retinal spot size of said rays.
Claim 2
Independent Claim
142 words
A method of constructing a lens for focusing light on the retina of the eye comprising the steps of: a) constructing a Fourier Transform function model that generates modulation transfer frequencies for the human eye and a preliminary lens, said lens having at least one rotationally symmetric surface defined by the equation: ##EQU4## where X is the aspheric surface point at position Y, r is the central radius, and κ is commonly used aspheric constant, wherein the value of κ is less than or equal to -1, b) performing an analysis using the model so constructed to trace light ray paths through the lens-eye system, c) varying the value of the aspheric constant, κ, for the preliminary lens to achieve a lens-eye system with a trace of light ray paths optimized for sharpest focus by minimizing retinal spot size of said rays.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein the lens so constructed is a contact lens.
Claim 4
Dependent Claim
28 words
The method of claim 1 wherein the value of κ is varied between about -1 and about 31 2 in optimizing the performance of the corrective lens-eye system.
Claim 5
Dependent Claim
22 words
The method of claim 1 wherein the modulation transfer frequency is compared to the diffraction limit to optimize the corrective lens-eye system.
Claim 6
Dependent Claim
28 words
The method of claim 1 wherein the eye in the corrective lens-eye system is emmetropic and the optimization process produces vision that exceeds that of the normal eye.
Claim 7
Dependent Claim
21 words
The method of claim 1 wherein the corrective lens-eye system is optimized by positioning the focused image closest to the retina.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-09-23 | 1995-03-25 | 1995-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-23 | 1999-03-25 | 1999-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-23 | 2003-03-25 | 2003-09-24 | $7700.00 | Window Closed / Lapsed |