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US 4,906,245 AGranted
Multiple element zone of focus artificial hydrogel lens
OwnerDennis T. Grendahlinventor
Life of this patent
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Abstract
An implantable or contact hydrogel lens for replacement of a defective natural lens in an eye in which various portions of the lens have different powers and focal lengths to produce in-focus images on the retina, of objects which are located at various distances from the eye, thereby substituting for the natural focusing action of the eye. The image processing capability of the brain functions to largely ignore the out-of-focus images and concentrate on the in-focus image of the object selected by the brain for consideration.
Claims11
A zone of focus hydrogel lens for use with an eye comprising:
- a. a plurality of hydrogel lens elements joined to form a unitary lens structure having a front surface, a rear surface and a circular periphery;
- b. each of said hydrogel lens elements serving to create an image on a distinct portion of the retina;
- and,
- c. at least two of said hydrogel lens elements having different powers whereby objects at different distances from the eye are simultaneously brought to a focus on distinct portions of the retina;
- and,
- d. at least two of said lens elements are of different colors.
3 more elements
Dependencies are inferred from the claim text.