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Proceedings Paper

Optical Surfaces Out Of Plastic For Spectacle Lenses
Author(s): Werner Koppen
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Paper Abstract

In comparison to precision optics, the demands made on a spectacle lens with respect to the macrogeometry are probably smaller, those made on material and surface quality are, however, in part even greater. The relatively large thermal expansion coefficient of plastics is only of secondary importance for a spectacle lens so, that the advantages of organic materials for ophthalmic optics such as low weight and high impact resistance can be utilized to a very great extent. The use of the thermosetting plastic CR 39 for the production. of high quality corrective lenses is at the moment indisputable thanks to its good scratch and wear resistance. Plastic lenses are either moulded directly as finished lenses or a second surface is mechanically joined to a moulded blank. The specific material properties must also be given special consideration. 'Hy the coating of plastic surfaces and this requires costly production processes in particular for the relatively thick hard, coatings for the mechanical protection of the surfaces.

Paper Details

Date Published: 10 November 1983
PDF: 10 pages
Proc. SPIE 0381, Optical Surface Technology, (10 November 1983); doi: 10.1117/12.934844
Show Author Affiliations
Werner Koppen, Optische Werke G. Rodenstack Isartalstrasse (Germany)

Published in SPIE Proceedings Vol. 0381:
Optical Surface Technology
Hermann Walter, Editor(s)

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