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US 5,089,024 AGranted
Multi-focal intraocular lens
AssigneeStorz Instrument Company
InventorsBruce A. Christie, Gary L. Guenthner, J. Warren Blaker
Life of this patent
Estimating the term…
Abstract
An intraocular lens, for use within the human eye, contains three concentric regions. An innermost region provides far-field vision. A middle region, surrounding the innermost region, provides near-field vision. An outermost region, surrounding the middle region, provides far-field vision. The intermost region is of a size such that, when the pupil constricts in bright light, the innermost region remains exposed to incoming light, and can thus focus distant images in bright light.
Claims2
An intraocular lens comprising:
- a) a first region, of long focal length, located near the center of the lens, and having a maximum diameter less than the average minimum diameter of a contracted pupil;
- b) a second region, of short focal length, which is substantially concentric about the first region, and having an inner diameter less than the average minimum diameter of a contracted pupil;
- c) a third region, of substantially the same focal length as the first region, and which is substantially concentric about the second region, and having an inner diameter not less than the average minimum diameter of a contracted pupil,
- d) the product of a first predetermined light intensity and the total area of said first region of long focal length located near the center of the lens being substantially equal to the product of a second predetermined light intensity and the total area of said second region of short focal length;
- e) said first predetermined light intensity being greater than said second predetermined light intensity and being about 100 lux;
- and
- f) said second predetermined light intensity being about 6 lux.
4 more elements
Dependencies are inferred from the claim text.