Spectacle lenses to reduce discomfort from aphakia and certain e

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65 30R, 65 32, 106 53, 106 54, 106DIG6, 428913, 428410, 106 47Q, C03C 326, C03C 308, C03C 330

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042846862

ABSTRACT:
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 about 440-550 nm and the transmittance of the remainder 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.

REFERENCES:
patent: 3892582 (1975-07-01), Simms
patent: 3920463 (1975-11-01), Simms
patent: 4018965 (1977-04-01), Kerko et al.
patent: 4118214 (1978-10-01), Wedding
patent: 4125405 (1978-11-01), Aravjo et al.
patent: 4190451 (1980-02-01), Hares et al.

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