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Proceedings Paper

Moulding process for contact lens
Author(s): Richard S. Skipper; David W. Shepherd
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Paper 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.

Paper Details

Date Published: 1 December 1991
PDF: 9 pages
Proc. SPIE 1529, Ophthalmic Lens Design and Fabrication, (1 December 1991); doi: 10.1117/12.50477
Show Author Affiliations
Richard S. Skipper, Pilkington Barnes-Hind Ltd. (United Kingdom)
David W. Shepherd, Pilkington Barnes-Hind Ltd. (United Kingdom)


Published in SPIE Proceedings Vol. 1529:
Ophthalmic Lens Design and Fabrication
Colin M. Perrott, Editor(s)

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