Multifocal artificial ocular lens with a transparency varying with illumination

US6017121A · kind A · utility

Assignee

• Essilor International (Compagnie Generale d'Optique) · FR

Inventors

• Nicolas Chateau · Paris, FR
• Corinne Grollier · Créteil, FR
• Dominique Baude · Saint-Ouen, FR

Key dates

• Filing date: Dec 30, 1996
• Grant date: Jan 25, 2000
• Expiry date: Dec 30, 2016

Classification

• Technology area (CPC G): Physics
• CPC primary: G02C7/046
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A multifocal artificial ocular lens has at least two corrective areas, namely a near vision area to correct near vision and a distance vision area to correct distance vision. The transparency of the lens varies in inverse proportion to its illumination. A photochromic substance is incorporated into the material of the lens, which improves optical performance. Applications include central near vision contact lenses.