Contact lens and a method for manufacturing contact lens

Details Contact lens and a method for manufacturing contact lens Contact lens and a method for manufacturing contact lens

1993-05-21

1995-09-19

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351160R, 451 64, G02C 704, B24B 5100

Patent

active

054520312

ABSTRACT:
A contact lens having a smooth surface is made through use of a computer implementing a spline approximation of corneal topology. Piecewise polynomials approximating the corneal topology have equal first and second derivatives where they join. A curve representing the central optical portion of the lens and the piecewise polynomial adjacent to the central optical portion curve have an equal first derivative where they join. A contact lens is cut corresponding to the smooth surface defined by the piecewise polynomials.

REFERENCES:
patent: 4976534 (1990-12-01), Miege et al.
patent: 4980993 (1991-01-01), Umezaki

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