Aspherical lens, method of producing the lens and apparatus for

Details Aspherical lens, method of producing the lens and apparatus for Aspherical lens, method of producing the lens and apparatus for

1991-03-19

1993-03-02

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351160R, 623 6, G02C 704, A61F 216

Patent

active

051913666

ABSTRACT:
The present invention relates to an aspherical lens as a refracting and correcting means for an eye, such as an intraocular lens and a contact lens, a method of producing the lens, and an apparatus for producing the lens. According to the present invention, it is possible to produce a lens which entirely removes a spherical aberration by arbitrarily controlling the spherical aberration and has an arbitrary focal depth and resolving power.
In the present invention, ray tracing is performed for an incident ray, a final passing point of the ray is compared with a preset desired final passing point, and a slope of a curved surface corresponding to the ray is determined so that both final passing points coincide with each other.
Furthermore, the shape of a lens is found by determining surface slopes respectively corresponding to heights of rays with respect to the optical axis as described above.

REFERENCES:
patent: 4838675 (1989-06-01), Barkan et al.

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