Zonal bifocal contact lens

Details Zonal bifocal contact lens Zonal bifocal contact lens

1977-09-14

1979-07-24

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

350211, G02B 308, G02B 310, G02C 704

Patent

active

041621220

ABSTRACT:
A multifocal lens design suitable for use as an opthalmic contact lens. A zonal bifocal contact lens utilizes the multifocal Fresnel lens designs which have their multifocal property distributed approximately throughout the lens. This is accomplished by a lens construction in which the optical facets are interfaced without any non-refractive ledges or steps occurring between adjacent facets.

REFERENCES:
patent: 2077092 (1937-04-01), Broder
patent: 3004470 (1961-10-01), Ruhle
Ziegler, J. F., "Fabrication or Correction of Optical Lenses", IBM Technical Disclosure Bulletin, vol. 12, No. 10, Mar. 1970, pp. 1573-1575.

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