Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1991-04-12
1994-03-22
Sugarman, Scott J.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
351162, 359558, 359570, G02C 704, G02B 518, G02B 2742
Patent
active
052968812
ABSTRACT:
A method of correcting or alleviating presbyopia in humans comprising (a) fitting a first contact lens to a first eye, and (b) fitting a second contact lens to the other eye. Each of the lenses has a first power provided by the shape, curvature and material of the lens to provide a refractive corrected image and a second power provided by diffractive means to provide a second corrected image, the second power being additive to (or subtracted from) the first power. The lenses are fitted so that one has a refractive near image optical power and the other has a refractive distance image optical power, and the diffractive means of the lenses are arranged so that the amount of the light directed into the near image by one lens is substantially greater than that directed into the far image by that lens, and the amount of light directed into the far image by the other lens is substantially greater than that directed into the near image by that other lens. In this way the wearer sees an image of relatively high intensity and retains a large amount of stereoscopic vision.
REFERENCES:
patent: 4881804 (1989-11-01), Cohen
patent: 4923296 (1990-05-01), Erickson
patent: 5002382 (1991-03-01), Saidner
patent: 5024517 (1991-06-01), Saidner
Pilkington Diffractive Lenses Limited
Sugarman Scott J.
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