Multifocal phase plate with a pure refractive portion

Details Multifocal phase plate with a pure refractive portion Multifocal phase plate with a pure refractive portion

1987-11-12

1989-11-21

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

35016216, 35016222, G02C 704, G02B 518, G02B 2744

Patent

active

048818046

ABSTRACT:
An ophthalmic contact lens with a phase plate and a pure refractive portion within its optic zone. The invention embraces an ophthalmic contact lens of the Cohen lens design with a phase plate and a pure refractive portion within its optic zone.

REFERENCES:
patent: 3309162 (1967-03-01), Kosanke et al.
patent: 3312519 (1967-04-01), Max
patent: 3728009 (1973-04-01), Fadotowsky et al.
patent: 4198132 (1980-04-01), Seger et al.
patent: 4210391 (1980-07-01), Cohen
patent: 4338005 (1982-07-01), Cohen
patent: 4340283 (1982-07-01), Cohen
patent: 4637697 (1987-01-01), Freeman
patent: 4641934 (1987-02-01), Freeman
patent: 4655565 (1987-04-01), Freeman

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