Multifocal contact lenses utilizing diffraction and refraction

Details Multifocal contact lenses utilizing diffraction and refraction Multifocal contact lenses utilizing diffraction and refraction

1983-10-19

1987-01-20

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

35016216, 35016222, 350452, 351177, G02C 704, G02C 706, G02B 308, G02B 2744

Patent

active

046376976

ABSTRACT:
A bifocal contact lens has diffractive power added to the basic refractive power provided by the material of the lens and the basic curvature of its front and rear surfaces. The diffractive power arises from concentric zones, each providing an asymmetric retardation of light across the zone width to direct design wavelength light predominantly into a required order and sign of diffraction, while other wavelength light is predominantly transmitted at zero order. Design wavelength light from an object at one distance can then be focused by way of diffraction of that order and sign, and other wavelength light from an object at another distance can be focused by way of zero order transmission. Preferably the zones are defined, and the asymmetric retardation provided, by a rear surface contour having steps but which approximates to the required basic curvature.

REFERENCES:
patent: 3004470 (1961-10-01), Ruhle
patent: 3339997 (1983-09-01), Wesley
patent: 3794414 (1974-02-01), Wesley
patent: 4073579 (1978-02-01), Deeg et al.
patent: 4162122 (1979-07-01), Cohen
patent: 4206518 (1980-06-01), Jardon et al.
patent: 4210391 (1980-07-01), Cohen
patent: 4338005 (1982-07-01), Cohen
patent: 4340283 (1982-07-01), Cohen
patent: 4377329 (1983-03-01), Poler
patent: 4402579 (1983-09-01), Poler
"The Leiske Physioflex Style 10 Anterior Chamber Lens", Surgide, Jan. 4/1981, No. 3-13.

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