Artificial eye lenses
First Claim
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1. An artificial eye lens having basic refractive power providing one focus, and having diffractive power which deviates some light from the basic refractive power focus to another focus.
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Abstract
A contact lens has a transmission hologram which provides diffractive power on a wavelength and/or amplitude selective basis whereby light from near and distant objects can be focussed on the retina of a presbyopic wearer. Similarly an implant lens can have a transmission hologram to correct for non-accommodative vision. The invention is particularly useful in providing an artificial eye lens with a bi-focal action without need for distinct near and far vision zones.
272 Citations
24 Claims
- 1. An artificial eye lens having basic refractive power providing one focus, and having diffractive power which deviates some light from the basic refractive power focus to another focus.
- 7. An artificial eye lens having a bi-focal action through basic power provided by the shape, curvature and material of the lens, and a different power provided through diffractive power.
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21. An artificial eye lens which is basically powerless, the lens having a transmission hologram which gives it diffractive power.
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24. An artificial eye lens dividing light passing through a common portion thereof and providing at least two foci for said light, each portion of said light being focused by diffraction.
Specification