SPECTACLE LENSES TO REDUCE DISCOMFORT FROM APHAKIA AND CERTAIN EYE DISEASES

This invention is concerned with producing glasses suitable for use as spectacle lenses for aphakics or for persons subject to photoretinitis or retinitis pigmentosa. The glasses exhibit near-zero transmittance of radiations having wavelengths shorter than a selected cutoff wavelength ranging betwee...

Full description

Saved in:
Bibliographic Details
Main Author WEDDING, BRENT M
Format Patent
LanguageEnglish
French
Published 26.04.1983
Edition3
Subjects
CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS
CHEMISTRY
CONTACT LENSES
GLASS
JOINING GLASS TO GLASS OR OTHER MATERIALS
METALLURGY
MINERAL OR SLAG WOOL
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
SPECTACLES
SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURESAS SPECTACLES
SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS
SURFACE TREATMENT OF GLASS
Online AccessGet full text

Cover

More Information
Summary:This invention is concerned with producing glasses suitable for use as spectacle lenses for aphakics or for persons subject to photoretinitis or retinitis pigmentosa. The glasses exhibit near-zero transmittance of radiations having wavelengths shorter than a selected cutoff wavelength ranging between about 440-550 nm and the transmittance of the reminder of the visible spectrum is adjusted through the glass demonstrating photochromic behavior. The inventive method contemplates exposing photochromic glass within a narrowly-defined composition range to a strongly-reducing atmosphere at temperatures between about 350.degree.-520.degree.C for a period of time of at least 12 hours to develop an integral colored surface layer on the glass.
Bibliography:Application Number: CA19810374858