Contact lenses made from thermoformable material

US5198477A · kind A · utility

Assignee

• Ciba-Geigy · US

Inventors

• Harro M. von der Haegen · Laufach, DE
• Bernhard Seiferling · Goldbach, DE

Key dates

• Filing date: Feb 25, 1992
• Grant date: Mar 30, 1993
• Expiry date: Feb 25, 2012

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B1/043
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

The invention relates to contact lenses made from a polymer comprising macrocycles that are made up of units of formula I EQU --(--CR.sup.1 .dbd.CR.sup.2 --A--)-- (I) wherein A is alkylene or alkenylene each having from 3 to 10 carbon atoms and each of which may be substituted by one or more R.sup.3 radicals, each of R.sup.1 and R.sup.2, independently of the other, is hydrogen or lower alkyl, and R.sup.3 is lower alkyl, fluorinated lower alkyl or a siloxane radical. They exhibit a combination of a high degree of hardness and oxygen permeability. They can be produced in an especially advantageous manner, that is to say by hot compression moulding.