Concentric aspheric multifocal lens designs
First Claim
1. An aspheric multifocal concentric annular ring lens which reduces aberrations and enhances contrast to provide improved visual acuity, comprising:
- a. a lens having a front surface and a back surface, wherein one of the front and back surfaces has an aspheric curve which comprises a spherical central area, and a surrounding aspheric annulus which comprises a simple elliptical, parabolic or hyperbolic curve; and
b. the other of the front and back surfaces comprises a multifocal curve having a plurality of concentric spherical annular rings providing both a distance image and a near image.
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Abstract
Concentric aspheric multifocal lens designs are disclosed which use a combination of an aspheric front surface, which results in aberration reduction and contrast vision enhancement, along with a concentric multifocal back surface, to produce a lens design which affords clear vision at a distance and also near without a loss in contrast which is generally typical of prior art simultaneous vision, concentric multifocal lens designs. The aspheric surface improves the modulation transfer function (MTF) of the lens eye combination which improves the focus and contrast of both distance and near images. The design form is valid for contact lenses and intraocular lenses.
243 Citations
23 Claims
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1. An aspheric multifocal concentric annular ring lens which reduces aberrations and enhances contrast to provide improved visual acuity, comprising:
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a. a lens having a front surface and a back surface, wherein one of the front and back surfaces has an aspheric curve which comprises a spherical central area, and a surrounding aspheric annulus which comprises a simple elliptical, parabolic or hyperbolic curve; and b. the other of the front and back surfaces comprises a multifocal curve having a plurality of concentric spherical annular rings providing both a distance image and a near image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of producing an aspheric multifocal concentric annular ring lens design which reduces aberrations and enhances contrast to provide improved visual acuity, comprising:
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a. producing a lens having a front surface and a back surface, wherein one of the front and back surfaces has an aspheric curve which comprises a spherical central area, and a surrounding aspheric annulus which comprises a simple elliptical, parabolic or hyperbolic curve and; b. the other of the front and back surfaces comprises a multifocal curve having a plurality of concentric spherical annular rings providing both a distance image and a near image; c. performing an in vivo image quality analysis, with an in vivo quality analysis instrument, of the lens on the eye to measure any residual aberrations; d. reducing the measured residual aberrations by redesigning the lens to improve visual acuity and performance. - View Dependent Claims (19, 20)
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21. An aspheric multifocal concentric annular ring lens which reduces aberrations and enhances contrast to provide improved visual acuity, comprising:
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a. a lens having a front surface and a back surface, wherein one of the front and back surfaces has an aspheric curve which has a progressive aspheric k value from 0 for a spherical curve in the center of the lens to a defined end point in the form of an elliptical, hyperbolic or parabolic curve, by a defined function, where k is a variable in the general conic equation y=x2 ÷
(r+√
r2 -(k+1)x2 ) such that k=0 for a sphere, k=-1 for a parabola, 0>
k>
-1 for an ellipse, and k<
-1 for a hyperbola; andb. the other of the front and back surfaces comprises a multifocal curve having a plurality of concentric spherical annular rings providing both a distant image and a near image.
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22. An aspheric multifocal concentric annular ring lens which reduces aberrations and enhances contrast to provide improved visual acuity, comprising:
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a. a lens having a front surface and a back surface, wherein one of the front and back surfaces has an aspheric curve which has a spherical central area to ease in vitro parameters and in vivo fitting, with a surrounding aspheric curve with a progressive aspheric k value from 0 for a spherical curve in the center of the lens to a defined end point in the form of an elliptical, hyperbolic or parabolic curve, by a defined function where k is a variable in the general conic equation y=x2 ÷
(r+√
r2 -(k+1)x2 ) such that k=0 for a sphere, k=-1 for a parabola, 0>
k>
-1 for an ellipse, and k<
-1 for a hyperbola; andb. the other of the front and back surfaces comprises a multifocal curve having a plurality of concentric spherical annular rings providing both a distant image and a near image. - View Dependent Claims (23)
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Specification