Patent US4795462A successfully refreshed from Google Patents.
US4795462A
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US
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Cylindrically segmented zone of focus artificial lens
Assignee: Individual
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Filing: 1987-08-24
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Granted: 1989-01-03
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Expires: 2007-08-24
Abstract
Abstract An implantable or contact lens for replacement of a defective natural lens in an eye in which various annular portions of the lens have different powers and focal lengths to produce in-focus images, on different portions of the retina, of objects which are located at various distances from the eye, thereby substituting for the natural focusing action of the eye. The image processing capability of the brain functions to largely ignore the out of focus images and concentrate on the in focus image of the object selected by the brain for consideration.
Inventors
- 👤 Dennis T. Grendahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:39
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/14; A61F2/16; A61F2/1613; A61F2/1616; A61F2/1618; A61F2250/00; A61F2250/0058; A61F2250/0096; A61F2250/0098
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
105 words
A zone of focus lens for use with an eye comprising: a. a cylindrical optical element; b. at least one annular optical element joined and concentric with said cylindrical element to form a unitary lens structure having a front surface, a rear surface and a circular periphery; c. each of said elements serving to create an image on distinct portions of the retina; d. at least two of said elements having different powers whereby objects at different distances from the eye are simultaneously brought to a focus on distinct portions of the retina; and, e. at least two of said lens elements are different colors.
Claim 2
Dependent Claim
105 words
A zone of focus lens for use with an eye comprising: a. a cylindrical optical element; b. at least one annular optical element joined and concentric with said cylindrical element to form a unitary lens structure having a front surface, a rear surface and a circular periphery; c. each of said elements serving to create an image on distinct portions of the retina; d. at least two of said elements having different powers whereby objects at different distances from the eye are simultaneously brought to a focus on distinct portions of the retina; and, e. at least two of said lens elements are different colors.
Claim 3
Dependent Claim
21 words
A lens according to claim 1 wherein at least two of said elements are of materials having different indices of refraction.
Claim 4
Dependent Claim
17 words
A lens according to claim 1 wherein at least two of said elements have different surface curvature.
Claim 5
Dependent Claim
27 words
A lens according to claim 3 further including a layer of transparent material overlying one of said front and rear surfaces to provide a smooth surface thereon.
Claim 6
Dependent Claim
27 words
A lens according to claim 3 further including first and second layers of transparent material overlying said front and rear surfaces, respectively, to provide smooth surfaces thereon.
Claim 7
Dependent Claim
16 words
A lens according to claim 1 wherein the boundaries between said elements include an anti-reflection material.
Claim 8
Dependent Claim
32 words
A lens according to claim 1 wherein the surface area of the boundaries between said elements are masked with an opaque material to block passage of rays which would otherwise cause reflections.
Claim 9
Dependent Claim
16 words
A lens according to claim 1 wherein said elements are joined with a transparent adhesive material.
Claim 10
Dependent Claim
14 words
A lens according to claim 8 wherein said adhesive material includes an anti-reflection additive.
Claim 11
Dependent Claim
12 words
A lens according to claim 1 wherein said elements are extrusion joined.
Claim 12
Dependent Claim
17 words
A lens according to claim 1 wherein adjacent ones of said elements have different indices of refraction.
Claim 13
Dependent Claim
15 words
A lens according to claim 1 comprised of elements each having different indices of refraction.
Claim 14
Dependent Claim
10 words
A lens according to claim 12 consisting of three elements.
Claim 15
Dependent Claim
11 words
A lens according to claim 11 having at least three elements.
Claim 16
Dependent Claim
26 words
A lens according to claim 1 wherein the front surface area of said annular element is greater than the front surface area of said cylindrical element.
Claim 17
Dependent Claim
25 words
A lens according to claim 1 wherein said elements providing sharp focus images of near objects are positioned within the inner half of the lens.
Claim 18
Dependent Claim
22 words
First and second lenses according to claim 1 for use in left and right eyes wherein like power elements are similarly positioned.
Claim 19
Dependent Claim
20 words
A lens according to claim 1 having a planar front surface and a convex rear surface to reduce internal reflections.
Claim 20
Dependent Claim
32 words
A lens according to claim 18 wherein the surface areas of the boundaries between said elements are masked with an opaque material to block passage of rays which would otherwise cause reflections.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
GB2181355A
Cited
US4666446A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-03 | 1992-07-04 | 1993-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-03 | 1996-07-04 | 1997-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-03 | 2000-07-04 | 2001-01-03 | $7700.00 | Window Closed / Lapsed |