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US 5,160,463 AGranted
Method of manufacturing a contact lens
AssigneePilkington Visioncare, Inc.
InventorsJohn M. Evans, Ashok R. Thakrar
Life of this patent
Estimating the term…
Abstract
A method of manufacturing a contact lens with an iris simulating pattern by moulding comprising applying to the mould at least two differing designs so as to form an overall pattern. This overall pattern is transferred to the surface or surfaces of the contact lens during moulding and curing thereof, where the designs transferred interact with each other to substantially cover the iris and produce a coloured natural simulation of the iris of the eye when in use.
Claims20
A method of manufacturing a contact lens from a liquid monomer which comprises:
- forming at least one of the contact lens surfaces by moulding, and providing an iris simulating pattern from ink made with a monomeric carrier material that is the same as said liquid monomer, the method further comprising:
- applying a first ink design to a mould surface:
- applying a second differing ink design to a mould surface:
- placing a predetermined amount of said liquid monomer between mould halves positioned to mould at least said one contact lens surface:
- polymerising the liquid monomer:
- whereby the first and second ink designs are transferred to the contact lens, dispersed in the polymer, during the moulding and curing of the contact lens, and the designs transferred to the contact lens interact with each other to form an iris simulating pattern which is not reliant upon the structure of the natural iris of the eye to give a natural appearance in a different color.
3 more elements
Dependencies are inferred from the claim text.