Toric multifocal contact lenses
First Claim
1. A toric multifocal contact lens comprising a central axis, 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 central optical zone and the second central optical zone has a central circular area and an annular region surrrounding the central circular area, wherein the central circular area has a diameter of about 1.0 to about 3.0 mm and is a progressive power addition zone for near vision correction and optionally for intermediate vision correction, wherein the annular region has a spherical or aspheric surface having an optical power for distant vision correction, wherein the central circular area and the annular region are concentric with the central axis, wherein the other one of the first central optical zone and the second central optical zone is a toroidal surface or a biconic surface, wherein the progressive power addition zone has a surface that provides a power addition profile defined by two or more linear functions of equation (3) or by equation (4) or equation (5)
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( x ) = b 1 + k 1 x 0 ≤ x < x 1 p ( x ) = b 2 + k 2 x x 1 ≤ x < x 2 ⋮ p ( x ) = b i + k i x x i - 1 ≤ x < x i ⋮ ( 3 ) p ( x ) = A 2 · cos ( x D 2 · π ) + A 2 ( 4 ) wherein p(x) is an added power at a distance of x from the center;p ( x ) = A · [ 1 - ( x D 2 ) n ] ( 5 )
bi is a coefficient which is the intercept of a linear line; and
ki is the rate of change of the added power as function of the distance from the center;
A is the maximum added power;
D is the diameter of the progressive power addition zone; and
n is any number which can be an integer or non-integer larger than 1 but smaller than or equal to 10, and wherein the first and second central optical zone combine to provide a cylindrical optical power to correct astigmatism vision errors and a multifocal optical power to compensate for presbyopia.
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Abstract
The present invention provides a toric multifocal contact lens having a cylindrical optical power to correct astigmatism vision errors and a multifocal power to compensate for presbyopia. A toric multifocal contact lens of the invention has a central axis, an anterior surface having a first central optical zone, and an opposite posterior surface having a second central optical zone. The first central optical zone and the second central optical zone combine to provide a cylindrical optical power to correct astigmatism vision errors and a multifocal power to compensate for presbyopia.
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Citations
50 Claims
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1. A toric multifocal contact lens comprising a central axis, 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 central optical zone and the second central optical zone has a central circular area and an annular region surrrounding the central circular area, wherein the central circular area has a diameter of about 1.0 to about 3.0 mm and is a progressive power addition zone for near vision correction and optionally for intermediate vision correction, wherein the annular region has a spherical or aspheric surface having an optical power for distant vision correction, wherein the central circular area and the annular region are concentric with the central axis, wherein the other one of the first central optical zone and the second central optical zone is a toroidal surface or a biconic surface, wherein the progressive power addition zone has a surface that provides a power addition profile defined by two or more linear functions of equation (3) or by equation (4) or equation (5) -
( x ) = b 1 + k 1 x 0 ≤ x < x 1 p ( x ) = b 2 + k 2 x x 1 ≤ x < x 2 ⋮ p ( x ) = b i + k i x x i - 1 ≤ x < x i ⋮ ( 3 ) p ( x ) = A 2 · cos ( x D 2 · π ) + A 2 ( 4 ) p ( x ) = A · [ 1 - ( x D 2 ) n ] ( 5 ) wherein p(x) is an added power at a distance of x from the center;
bi is a coefficient which is the intercept of a linear line; and
ki is the rate of change of the added power as function of the distance from the center;
A is the maximum added power;
D is the diameter of the progressive power addition zone; and
n is any number which can be an integer or non-integer larger than 1 but smaller than or equal to 10, andwherein the first and second central optical zone combine to provide a cylindrical optical power to correct astigmatism vision errors and a multifocal optical power to compensate for presbyopia. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of producing a toric multifocal contact lens, comprising the steps of shaping a contact lens by a manufacturing means to have a central axis, an anterior surface having a first central optical zone, and an opposite posterior surface having a second central optical zone, wherein the first and second optical zones combine together to provide a cylindrical optical power to correct astigmatism vision errors and a multifocal power to compensate for presbyopia,
wherein one of the first central optical zone and the second central optical zone has a central circular area and an annular region surrrounding the central circular area, wherein the central circular area has a diameter of about 1.0 to about 3.0 mm and is a progressive power addition zone for near vision correction and optionally for intermediate vision correction, wherein the annular region has a spherical or aspheric surface having an optical power for distant vision correction, wherein the central circular area and the annular region are concentric with the central axis, wherein the other one of the first central optical zone and the second central optical zone is a toroidal surface or a biconic surface, wherein the progressive power addition zone has a surface that provides a power addition profile defined by two or more linear functions of equation (3) or by equation (4) or equation (5) -
( x ) = b 1 + k 1 x 0 ≤ x < x 1 p ( x ) = b 2 + k 2 x x 1 ≤ x < x 2 ⋮ p ( x ) = b i + k i x x i - 1 ≤ x < x i ⋮ ( 3 ) p ( x ) = A 2 · cos ( x D 2 · π ) + A 2 ( 4 ) p ( x ) = A · [ 1 - ( x D 2 ) n ] ( 5 ) wherein p(x) is an added power at a distance of x from the center;
bi is a coefficient which is the intercept of a linear line; and
ki is the rate of change of the added power as function of the distance from the center;
A is the maximum added power;
D is the diameter of the progressive power addition zone; and
n is any number which can be an integer or non-integer larger than 1 but smaller than or equal to 10. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A series of toric multifocal contact lenses comprising contact lenses having a series of different cylindrical optical power corrections, wherein each contact lens in the series has has a central axis, an anterior surface having a first central optical zone, and an opposite posterior surface having a second central optical zone,
wherein the first central optical zone and the second central optical zone combine to provide a cylindrical optical power to correct astigmatism vision errors and a multifocal power to compensate for presbyopia, wherein one of the first central optical zone and the second central optical zone has a central circular area and an annular region surrrounding the central circular area, wherein the central circular area has a diameter of about 1.0 to about 3.0 mm and is a progressive power addition zone for near vision correction and optionally for intermediate vision correction, wherein the annular region has a spherical or aspheric surface having an optical power for distant vision correction, wherein the central circular area and the annular region are concentric with the central axis, wherein the other one of the first central optical zone and the second central optical zone is a toroidal surface or a biconic surface, wherein the progressive power addition zone has a surface that provides a power addition profile defined by two or more linear functions of equation (3) or by equation (4) or equation (5) -
( x ) = b 1 + k 1 x 0 ≤ x < x 1 p ( x ) = b 2 + k 2 x x 1 ≤ x < x 2 ⋮ p ( x ) = b i + k i x x i - 1 ≤ x < x i ⋮ ( 3 ) p ( x ) = A 2 · cos ( x D 2 · π ) + A 2 ( 4 ) p ( x ) = A · [ 1 - ( x D 2 ) n ] ( 5 ) wherein p(x) is an added power at a distance of x from the center;
bi is a coefficient which is the intercept of a linear line; and
ki is the rate of change of the added power as function of the distance from the center;
A is the maximum added power;
D is the diameter of the progressive power addition zone; and
n is any number which can be an integer or non-integer larger than 1 but smaller than or equal to 10. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. A toric multifocal contact lens comprising a central axis, an anterior surface having a first central optical zone, and an opposite posterior surface having a second central optical zone,
wherein at least one of the first central optical zone and the second central optical zone has a central circular area and an annular region surrounding the central circular area and has a surface that provides along each of a series of meridians a power that decreases progressively from the center to the inner peripheral edge of the annular region and then remains substantially constant, wherein the power profile of said circular area along each of the series of meridians is describe by a plurality of linear equations (6) or by equation (7) or (8) -
( x ) = b 1 + k 1 x + p θ 0 ≤ x 〈 x 1 P θ ( x ) = b 2 + k 2 x + p θ x 1 ≤ x 〈 x 2 ⋮ P θ ( x ) = b i + k i x + p θ x i - 1 ≤ x 〈 x i ⋮ ( 6 ) P θ ( x ) = A 2 · cos ( π x D 2 ) + A 2 + p θ ( 7 ) P θ ( x ) = A · [ 1 - ( x D 2 ) n ] + p θ ( 8 ) in which Pθ
(x) is a power along a meridian at a distance of x from the center within said circular area;
bi is a coefficient which is the intercept of a linear line;
ki is the rate of change of the added power as function of the distance from the center; and
Pθ
is the base power along that meridian,wherein the central circular area has a diameter of about 1.0 to about 3.0 mm, wherein the central circular area and the annular region are concentric with the central axis and provide one identical cylindrical optical power for correcting astigmatism vision errors. - View Dependent Claims (43, 44, 45, 46, 47, 48, 49, 50)
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Specification