Multifocal aspheric lens
OwnerJohn B. W. Lettinventor
Life of this patent
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Abstract
The present invention provides a lens having a plurality of vision areas. The plurality of areas including a first vision area, a second vision area surrounding the first vision area, and a third vision area surrounding the second vision area. The first vision area having a first power, the second vision area having a range of powers, and the third vision area having a second power distinct from the first power. One of the first, second and third vision areas having an aspheric surface designed to provide a monotonic gradient in power and the other areas having either spherical surfaces to provide single power values or aspheric surfaces designed to correct optical aberrations within these single power areas.
Claims76
A multifocal contact lens comprising:
- a plurality of areas including a first vision area, a second vision area surrounding the first vision area, and a third vision area surrounding the second vision area, the first vision area having a first substantially single power, the second vision area having a range of powers, the third vision area having a second substantially single power distinct from the first single power, at least one of the first, second and third vision areas having an aspheric surface and the other areas having spherical surfaces wherein the first vision area, the second vision area and the third vision area include intervening transition areas having a single direction of concavity wherein the first vision area has a near correction power and the third vision area has a distance correction power.
A multifocal contact lens comprising:
- a plurality of areas including a first vision area, a second vision area, and a third vision area, the second vision area between the first vision area and the third vision area, the first, second and third vision areas having distinct powers with a monotonic power change and defining a portion of a surface profile of the lens wherein the direction of concavity does not change.
An ophthalmic kit for use with a multifocal contact lens comprising:
- a sterile packaged contact lens in a bacteriostatic or sterile solution, said lens having a plurality of areas including a first vision area, a second area, and a third vision area, the second vision area between the first vision area and the third vision area, the first, second and third vision areas having distinct powers with a monotonic power change and defining a portion of a surface profile of the lens wherein the direction of concavity does not change.
A method of using a multifocal contact lens comprising the steps of:
- a user placing the contact lens over a pupil of the user's eye, the contact lens having a plurality of areas including a first vision area, a second area, and a third vision area, the second vision area between the first vision area and the third vision area, the first, second and third vision areas having distinct powers with a monotonic power change and defining a portion of a surface profile of the lens wherein the direction of concavity does not change.
Multifocal contact lens comprising:
- a first spherical zone in the center of the contact lens having a diameter between 1.2 and 2.1 mm, configured to provide vision for near objects;
- an aspheric zone surrounding the first spherical zone;
- a second spherical zone surrounding the aspheric zone configured to provide vision for distant objects wherein the first spherical zone, the aspheric zone and the second spherical zone include intervening transition areas having a single direction of concavity and a substantially monotonic power change.
A method of manufacturing a made-to-order multifocal contact lens comprising the steps of:
- measuring at least one of a user's pupil sizes and a required add power for the lens;
- manufacturing a multifocal lens having a plurality of vision areas including at least one of sizing the spherical and aspherical areas to suit the needs of the user and providing the lens with an add power corresponding to the required add power of the user, the lens including a first vision area, a second vision area surrounding the first vision area, and a third vision area surrounding the second vision area, the first vision area having a first substantially single power, the second vision area having a range of powers, the third vision area having a second substantially single power distinct from the first single power, at least one of the first, second and third vision areas having an aspheric surface and the other areas having spherical surfaces wherein the first vision area, the second vision area and the third vision area include intervening transition areas having a single direction of concavity and a monotonic power change.
Dependencies are inferred from the claim text.