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- W2078486548 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.© (1983) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only." @default.
- W2078486548 created "2016-06-24" @default.
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- W2078486548 date "1983-11-10" @default.
- W2078486548 modified "2023-10-05" @default.
- W2078486548 title "<title>Optical Surfaces Out Of Plastic For Spectacle Lenses</title>" @default.
- W2078486548 doi "https://doi.org/10.1117/12.934844" @default.
- W2078486548 hasPublicationYear "1983" @default.
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