Method of making a clear axis, segmented multifocal ophthalmic l

Details Method of making a clear axis, segmented multifocal ophthalmic l Method of making a clear axis, segmented multifocal ophthalmic l

1993-05-14

1996-04-30

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Including step of mold making

264 18, 425808, B29D 1100

Patent

active

055122205

ABSTRACT:
A method of making a multifocal refractive lens to focus light on the retina of the eye. The lens includes a plurality of segments, having different optical powers, at least one for distance vision and another for near. The lens does not require orientation to produce adequate far and near vision and normal stereoscopic effect. One or both of the segments having the optical powers may have aspherical lens surface. The central zone of the lens consists of only one lens segment, providing a clear central axis. Segments of the other optical power border the first segment along a path defined by a semi-circle or hyperbola that extends from one point along the periphery of the adjoining segments to another point along the periphery of the adjoining segments.

REFERENCES:
patent: 3109696 (1963-11-01), Whitney
patent: 3555126 (1971-01-01), Gitson
patent: 4426139 (1984-01-01), van Ligten et al.
patent: 4605524 (1986-08-01), Danker
patent: 4676610 (1987-06-01), Barkan et al.
patent: 4923296 (1990-05-01), Erickson
patent: 5096285 (1992-03-01), Silberman
patent: 5219497 (1993-06-01), Blum

Affiliated with

Also associated with

Rating

Method of making a clear axis, segmented multifocal ophthalmic l does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of making a clear axis, segmented multifocal ophthalmic l, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of making a clear axis, segmented multifocal ophthalmic l will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-626150