US4641934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ophthalmic lens with diffractive power
Assignee: Novartis AG
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Filing: 1983-09-20
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Granted: 1987-02-10
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Expires: 2003-09-20
Abstract
Abstract An ophthalmic lens incorporates a transmission hologram which has negative diffractive power and introduces positive longitudinal chromatic aberration to add to the natural longitudinal chromatic aberration of the human eye, thereby reducing the need to accommodate. The lens also has refractive power to balance the diffractive power or to give a desired overall or residual power.
Inventors
- 👤 Michael H. Freeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:26
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; A; A61; A61F; A61F2/00; A61F2/02; A61F2/14; G02C2202/00; G02C2202/20
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
36 words
An ophthalmic lens comprising diffracting means providing negative diffractive power which introduces positive longitudinal chromatic aberration that adds to the natural longitudinal chromatic aberration of the eye and hence increases the range of the chromatic effect.
Claim 2
Dependent Claim
36 words
An ophthalmic lens comprising diffracting means providing negative diffractive power which introduces positive longitudinal chromatic aberration that adds to the natural longitudinal chromatic aberration of the eye and hence increases the range of the chromatic effect.
Claim 3
Dependent Claim
28 words
A lens according to claim 1 having diffractive power of about -3.4D dioptres where D dioptres is the extent of positive longitudinal chromatic aberration required to be introduced.
Claim 4
Dependent Claim
9 words
A lens according to claim 1 having refractive power.
Claim 5
Dependent Claim
10 words
A lens according to claim 3 having positive refractive power.
Claim 6
Dependent Claim
22 words
A lens according to claim 4 in which the refractive power is of a magnitude such as to balance the diffractive power.
Claim 7
Dependent Claim
30 words
A lens according to claim 3 in which the relative values of the diffractive and refractive powers are such as to provide the lens with an overall or residual power.
Claim 8
Dependent Claim
21 words
A lens according to claim 3 whose refractive power is provided by faces which are curved as viewed in axial section.
Claim 9
Dependent Claim
15 words
A lens according to claim 7 in which the curved faces are of spherical curvature.
Claim 10
Dependent Claim
24 words
A lens according to claim 3 in which the magnitudes of the diffractive and refractive powers reduce from the centre of the lens outwardly.
Claim 11
Dependent Claim
43 words
A lens according to claim 9 in which the magnitudes of the diffractive and refractive powers reduce in a manner such that red light from a distant object remains at substantially the same focus over the whole visually used area of the lens.
Claim 12
Dependent Claim
17 words
A lens according to claim 1 in which the diffractive power is provided by a transmission hologram.
Claim 13
Dependent Claim
7 words
A contact lens according to claim 1.
Claim 14
Dependent Claim
7 words
A spectacle lens according to claim 1.
Claim 15
Dependent Claim
7 words
An implant lens according to claim 1.
Claim 16
Dependent Claim
21 words
A lens according to claim 1 having an efficiency of diffraction more than 50% at all wavelengths across the visible spectrum.
Claim 17
Dependent Claim
16 words
A lens according to claim 15 having a maximum efficiency of diffraction of more than 70%.
Claim 18
Dependent Claim
26 words
A lens according to claim 15 in which the difference between the maximum and minimum efficiencies of diffraction across the visible spectrum is less than 20%.
Claim 19
Dependent Claim
70 words
An ophthalmic lens comprising diffracting means providing negative diffractive power which introduces positive longitudinal chromatic aberration that adds to the natural longitudinal chromatic aberration of the eye and hence increases the range of the vision of the eye at any one accomodation setting by increasing the spacing between a blue object at one distance and a red object at a greater distance whose images are sharply focused on the retina.
Claim 20
Dependent Claim
70 words
An ophthalmic lens comprising diffracting means providing negative diffractive power which introduces positive longitudinal chromatic aberration that adds to the natural longitudinal chromatic aberration of the eye and hence increases the range of the vision of the eye at any one accomodation setting by increasing the spacing between a blue object at one distance and a red object at a greater distance whose images are sharply focused on the retina.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-09 | 1990-08-11 | 1991-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-09 | 1994-08-11 | 1995-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-09 | 1998-08-11 | 1999-02-10 | $7700.00 | Window Closed / Lapsed |