Patent US5408281A successfully refreshed from Google Patents.
US5408281A
Expired / Lapsed
US
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Multifocal contact lens
Assignee: Ciba Vision Corp
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Filing: 1993-04-26
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Granted: 1995-04-18
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Expires: 2013-04-26
Abstract
Abstract A multifocal ophthalmic lens has a spiral-like pattern on its surface in an area overlying the cornea of a wearer of the lens. The spiral-like pattern is capable of providing a plurality of different dioptric powers.
Inventors
- 👤 Xiaoxiao Zhang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:56
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/12; G02B; G02B5/00; G02B5/18; G02B5/1876; G02C7/02; G02C7/04; G02C7/041; G02C7/042; G02C7/044; G02C2202/00; G02C2202/20
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
136 words
A multifocal ophthalmic lens having a spiral-like pattern on its surface in an area overlying the cornea of a wearer of the lens, said spiral-like pattern capable of providing a plurality of different dioptric powers, wherein said spiral-like pattern follows the equation: T(x,y)=STEP(S) wherein STEP(S) is a step function defined as 1 when S≧0 and 0 when S<0; and wherein T=1 indicates light transmission is 100% and T=0 indicates light transmission is 0%; and wherein S is calculated by the equation: S(x,y)=sin [πP/2λ(x.sup.2 +y.sup.2)+kA(tan (y/x))+β] wherein P is the power difference between two extreme foci, λ is the wavelength of interest, k is a spiral shape control parameter, x and y are the Cartesian coordinates of the lens with the origin located at the center of the lens and is β the starting phase control parameter.
Claim 2
Dependent Claim
136 words
A multifocal ophthalmic lens having a spiral-like pattern on its surface in an area overlying the cornea of a wearer of the lens, said spiral-like pattern capable of providing a plurality of different dioptric powers, wherein said spiral-like pattern follows the equation: T(x,y)=STEP(S) wherein STEP(S) is a step function defined as 1 when S≧0 and 0 when S<0; and wherein T=1 indicates light transmission is 100% and T=0 indicates light transmission is 0%; and wherein S is calculated by the equation: S(x,y)=sin [πP/2λ(x.sup.2 +y.sup.2)+kA(tan (y/x))+β] wherein P is the power difference between two extreme foci, λ is the wavelength of interest, k is a spiral shape control parameter, x and y are the Cartesian coordinates of the lens with the origin located at the center of the lens and is β the starting phase control parameter.
Claim 3
Dependent Claim
30 words
The multifocal ophthalmic lens of claim 1, wherein the spiral-like pattern is of a comprised band forming a diffraction grating capable of alternating the angle of impact of light rays.
Claim 4
Dependent Claim
20 words
The multifocal lens of claim 2, wherein the band has a cross-sectional profile in the form of an undulating curve.
Claim 5
Dependent Claim
23 words
The multifocal ophthalmic lens of claim 2, wherein the band is capable of modifying the spectrum transmission of light within the visible range.
Claim 6
Dependent Claim
35 words
The multifocal lens of claim 4, wherein the band is comprised of ink provided onto a surface of the lens, said ink being capable of modifying the spectrum transmission of light within the visible range.
Claim 7
Dependent Claim
28 words
The multifocal lens of claim 4, wherein the band is comprised of ink provided onto a surface of the lens and the spaces between the band is clear.
Claim 8
Dependent Claim
51 words
The multifocal lens of claim 4, wherein the band is comprised of a first ink capable of transmitting a first range of spectrum light and the space between the band is a second ink capable of transmitting a second range of spectrum light different from the first range of spectrum light.
Claim 9
Dependent Claim
15 words
The multifocal lens of claim 5, wherein the ink transmits light in the Red-Yellow range.
Claim 10
Dependent Claim
16 words
The multifocal lens of claim 7, wherein the first ink transmits light in the Red-Yellow range.
Claim 11
Dependent Claim
16 words
The multifocal lens of claim 9, wherein the second ink transmits light in the Green-Blue range.
Claim 12
Dependent Claim
18 words
The multifocal lens of claim 4, wherein the band is comprised of selectively polarized areas of lens material.
Claim 13
Dependent Claim
21 words
The multifocal lens of claim 4, wherein the band is comprised of selective areas of lens material having different refractive indicies.
Claim 14
Dependent Claim
20 words
The multifocal lens of claim 1, wherein the lens is adapted to be located on the surface of the eye.
Claim 15
Dependent Claim
18 words
The multifocal lens of claim 1, wherein the lens is adapted to be permanently retained within the eye.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1998-04-17 | 1998-10-17 | 1999-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-04-17 | 2002-10-17 | 2003-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-04-17 | 2006-10-17 | 2007-04-18 | $7700.00 | Window Closed / Lapsed |