Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1988-04-21
1991-12-03
Arnold, Bruce Y.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
351177, G02C 704
Patent
active
050695428
ABSTRACT:
A contact lens has an elliptical inside surface with a numerical eccentricity of 0.2 to 0.5 and a zenith radius of curvature of 8.0 to 8.4 mm. The inside surface preferably has a peripheral, circularly cross sectioned bevelled zone. As a soft contact lens, it has these dimensions when fully hydrated and preferably consists of a copolymer comprising of 50% to 90% hydroxyethyl-methacrylate (HEMA) by weight, 2% to 20% one or more unsaturated carboxylic acids, 2% to 20% one or more base monomers, 5% to 25% aliphatic acrylate or methacrylate, and 0.1% to 1% of a dialkylene-glycol-dimethacrylate cross-linker.
REFERENCES:
patent: 3187338 (1965-06-01), Neefe
patent: 3227507 (1966-01-01), Feinbloom
patent: 3482906 (1969-12-01), Volk
patent: 3950082 (1976-04-01), Volk
patent: 4165158 (1979-08-01), Travnicak
patent: 4180308 (1979-12-01), Mancini et al.
Barenz Manfred
Hofer Peter
Muller Ulrich
Muller-Lierheim Wolfgang
Schafer Horst
Arnold Bruce Y.
Sugarman Scott J.
Titmus Eurocon Kontaktlinsen GmbH & Co. KG.
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