Moulding process for contact lens

Richard S. Skipper; David W. Shepherd

doi:10.1117/12.50477

1 December 1991 Moulding process for contact lens

Richard S. Skipper, David W. Shepherd

Proceedings Volume 1529, Ophthalmic Lens Design and Fabrication; (1991) https://doi.org/10.1117/12.50477
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

Cast molding of contact lenses from a polymerizable monomer composition, encapsulated between two molds, offers a route to a highly reproducible product. Unfortunately, some of the reproducible characteristics are not desirable. In particular, the edge profile is often uneven and causes patient discomfort, or worse. To ensure a good quality edge with current molding processes, it is necessary to polish it. In the polishing steps the final edge profile can vary, but in addition other faults such as scratches and tears, not to mention general handling faults, depress yields and reduce the quality of a perfectly molded lens. This paper describes a process which not only produces a uniform, safe, and comfortable edge but which, by SPC methods, reduces all handling to a minimum and ensures the patient receives a healthy lens of consistently high quality.

Citation Download Citation

Richard S. Skipper and David W. Shepherd "Moulding process for contact lens", Proc. SPIE 1529, Ophthalmic Lens Design and Fabrication, (1 December 1991); https://doi.org/10.1117/12.50477

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