Bifocal contact lenses

Details Bifocal contact lenses Bifocal contact lenses

1995-11-28

1998-08-25

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

G02C 704

Patent

active

057988170

ABSTRACT:
A bifocal contact lens has a viewing area divided into a plurality of near vision zones (1,3A) and distance vision zones (2,2A, 3) which are substantially concentric with respect to the optical axis (P,Q) of the lens. Each near vision zone is adjacent to a distance vision zone or to a middle distance zone and at least one of the near vision zones comprises an aspherical lenticular surface. An important advantage of the lens is that the aspherical surface can be merged into an adjacent spherical surface with less discontinuity at the junction between the adjacent zones.

REFERENCES:
patent: 4162122 (1979-07-01), Cohen
patent: 4890913 (1990-01-01), De Carle
patent: 4898461 (1990-02-01), Portney
patent: 5326348 (1994-07-01), Nordan

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