Series of aspherical contact lenses
First Claim
1. A series of contact lenses, each lens in the series having a targeted optical power within the range of −
- 15 diopters to 10 diopters for correcting correcting myopia or hypermetropia, each lens in the series comprising an anterior surface having a first central optical zone and an opposite posterior surface having a second central optical zone, wherein the second central optical zones of all the lens in the series are substantially identical to each other and are aspherical surfaces, wherein the first central optical zone of each lens in the series has an aspherical design that, in combination with the second central optical zone, provides an optical power profile selected from the group consisting of (1) a substantially constant optical power profile, (2) a power profile mimicking the optical power profile of a spherical lens with an identical targeted optical power, and (3) a power profile in which lens spherical aberration at 6 mm diamter is from about 0.65 diopter to about 1.8 diopters more negative than spherical aberration at 4 mm diameter.
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Accused Products
Abstract
The present invention provides a series of aspherical contact lenses, each lens having a first central optical zone on its anterior surface and a second central optical zone on its posterior surface. Both central optical zones are aspherical surfaces. The first central optical zone is designed to have a surface which provides a target optical power and an optical power profile selected from the group consisting of (1) a substantially constant optical power profile, (2) a power profile mimicking the optical power profile of a spherical lens with an identical targeted optical power, and (3) a power profile in which lens spherical aberration at 6 mm diameter is from about 0.65 diopter to about 1.8 diopters more negative than spherical aberration at 4 mm diameter.
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Citations
25 Claims
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1. A series of contact lenses, each lens in the series having a targeted optical power within the range of −
- 15 diopters to 10 diopters for correcting correcting myopia or hypermetropia, each lens in the series comprising an anterior surface having a first central optical zone and an opposite posterior surface having a second central optical zone, wherein the second central optical zones of all the lens in the series are substantially identical to each other and are aspherical surfaces, wherein the first central optical zone of each lens in the series has an aspherical design that, in combination with the second central optical zone, provides an optical power profile selected from the group consisting of (1) a substantially constant optical power profile, (2) a power profile mimicking the optical power profile of a spherical lens with an identical targeted optical power, and (3) a power profile in which lens spherical aberration at 6 mm diamter is from about 0.65 diopter to about 1.8 diopters more negative than spherical aberration at 4 mm diameter.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for making a series of contact lenses, comprising the steps of:
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i) desigining a posterior surface comprising a first central optical zone which is an aspherical surface defined by eq. (1) in which S1 is the saggital height, c1 is the apical curvature (the reciprocal of the apical radius), x is the radial distance from the apex, and k1 is a conic constant;
ii) designing an anterior surface comprising a second central optical zone, wherein the second central optical zone is a surface defined by in which S2 is the saggital height, c2 is the apical curvature (the reciprocal of the apical radius), x is the radial distance from the apex, k2 is a conic constant, and α
1 to α
7 are the coefficients;
iii) for each lens in the series adjusting one or more of c2, k2, and α
1 to α
7 while keeping c1 and k1 unchanged, so as to provide a targeted optical power within a range from −
15 diopters to 10 diopters and an optical power profile selected from the group consisting of (1) a substantially constant optical power profile, (2) a power profile mimicking the optical power profile of a spherical lens with an identical targeted optical power, and (3) a power profile in which lens spherical aberration at 6 mm diamter is from about 0.65 diopter to about 1.8 diopters more negative than spherical aberration at 4 mm diameter; and
iv) producing each lens in the series by lathing or molding. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A series of contact lenses, each lens in the series having a targeted optical power withing the range of −
- 15 diopters to −
6 diopters, each lens in the series comprising an anterior surface having a first central optical zone and an opposite posterior surface having a second central optical zone, wherein one of the first and second central optical zones of each lens in the series is a spherical surface whereas the other is an aspherical surface, wherein the aspherical surface of each lens in the series has a design that, in combination with the spherical surface, provides an optical power profile in which lens spherical aberration at 6 mm diamter is from about 0.65 diopter to about 1.8 diopters more negative than spherical aberration at 4 mm diameter. - View Dependent Claims (20, 21, 22, 23, 24, 25)
- 15 diopters to −
Specification