Corneal contact lens fabricated from transparent silicone rubber

• US 3,228,741 A
• Filed: 06/29/1962
• Issued: 01/11/1966
• Est. Priority Date: 06/29/1962
• Status: Expired due to Term

• Current Assignee: Walter E. Becker
• Original Assignee: Walter E. Becker
• Inventors: Becker, Walter E.
• Application Number:
  US04/206,281
• Time in Patent Office: 1,292 Days
• US Class Current: 351/159.04
• CPC Class Codes: G02C 7/04 Contact lenses for the eyes disinfection or sterilisation of contact lenses A61L12/00
• CPC Class Codes: Y10S 128/21 Silicone

Claims

1. AN IMPROVED CORNEAL CONTACT LENS OF CONCAVO-CONVEX SHAPE ADAPTED TO FLOAT ON AND ADHERE TO THE CORNEA, SAID LENS HAVING A CONCAVE SURFACE CURVATURE SUBSTANTIALLY CONFORMING TO THE CORNEA, SAID LENS BEING FABRICATED FROM TRANSPARENT SILICON RUBBER HAVING A SOFTNESS APPROXIMATING THAT OF THE HUMAN CORNEA, SAID CONTACT LENS BEING BENDABLE UPON ITSELF AND CAPABLE OF RETURNING TO ITS ORIGINAL SHAPE UPON RELEASE OF DISTORTING FORCES AND BEING SUBSTANTIALLY UNBREAKABLE, SAID SILICONE RUBBER HAVING A GAS PERMEABILITY FOR OXYGEN AND CARBON DIOXIDE OF AT LEAST ABOUT 10,000 CC. PER 24-HOUR PERIOD PER 100 SQUARE INCH AREA PER 1 MIL THICKNESS AT A PRESSURE DIFFERENTIAL OF ONE ATMOSPHERE, THEREBY PROVIDING A CONTACT LENS WHICH IS SUBSTANTIALLY NON-ABSORPTIVE OF TEAR FLUIDS IN LIQUID FORM AND WHOSE GAS PERMEABILITY IS SUFFICIENTLY TO SUBSTANTIALLY INCREASE ITS NORMAL SAFE WEARING TIME.