Contact lens and compositions

US4463148A · kind A · utility

Assignee

• Titmus Eurocon Kontaktlinsen GmbH & Co. KG.

Inventors

• Peter Hofer · Liestal, CH
• Ulrich Muller · Goldbach, DE
• Manfred Barenz · Dreieich, DE
• Horst Schafer · Aschaffenburg, DE
• WOLFGANG GEORG KONRAD MÜLLER-LIERHEIM · Bad Abbach, DE

Key dates

• Filing date: May 6, 1983
• Grant date: Jul 31, 1984
• Expiry date: May 6, 2003

Classification

• Technology area (CPC G): Physics
• CPC primary: G02C7/04
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A soft contact lens having in preferred embodiment an elliptical inside surface which has a numerical eccentricity of 0.2 to 0.5 and a zenith radium of curvature of 8.0 to 8.4 mm. It preferably consists of a copolymer comprising of 50% to 90% hydroxyethyl-methacrylate (HEMA) by weight, 2% to 20% one or more unsaturated carboxylic acids, 2% to 20% one or more base monomers, 5% to 25% aliphatic acrylate or methacrylate, and 0.1% to 1% of a dialkylene-glycol-dimethacrylate crosslinker.