Aspherical contact lens for correcting presbyopia

Details Aspherical contact lens for correcting presbyopia Aspherical contact lens for correcting presbyopia

1991-11-08

1998-08-04

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

G02C 704

Patent

active

057902313

ABSTRACT:
A contact lens has a spherical surface (the rear surface, for example) and an aspherical surface (in this case, the front surface). The caustic curve of the wave surface which emerges from the contact lens comprises two cusps, one of which is paraxial and the other of which is marginal. The lens has applications in the correction of presbyopia.

REFERENCES:
patent: 4580882 (1986-04-01), Nuchman et al.
patent: 4640595 (1987-02-01), Volk

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