Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
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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