Contact lens

US5044742A · kind A · utility

Inventor

• Amir Cohen · Shoham, IL

Key dates

• Filing date: Mar 21, 1989
• Grant date: Sep 3, 1991
• Expiry date: Mar 21, 2009

Classification

• Technology area (CPC G): Physics
• CPC primary: G02C2202/02
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A contact lens comprising a central, optically active zone and a peripheral, optically nonactive zone, the lens having an anterior surface and a posterior surface, the posterior surface being constituted by the collective surfaces of a plurality of pad-like projections forming together a first, at least partially optically active surface, being the surface making contact with the cornea, the pad-like projections being separated from each other by a system of substantially interconnected recesses leading to the edge of the lens, the collective bottom surfaces of which recesses constitute a second, at least partially optically active surface, the system of recesses serving as reservoir for an increased tear volume and as passageway for increased tear flow, wherein the lens is consituted by a system of first lens elements each defined by the anterior surface on the one hand and the surface of the pad-like projection on the other, and by a system of second lens elements each defined by the anterior surface on the one hand and the bottom surface of the recesses on the other. When the recesses are filled with tears, the first and second lens elements are at least approximately of equal r…