Light shielding material

Details Light shielding material Light shielding material

1979-06-08

1982-01-19

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351 45, G02C 710, G02C 716

Patent

active

043113680

ABSTRACT:
A light shielding material having a gradient of the luminous transmittance in the vertical direction and comprising at least two regions consecutive to each other and different from each other in the luminous transmittance is provided. The luminous transmittance of one region is in the range of from 30% to 75% and the luminous transmittance of the other region is up to 25%, and said other region includes a portion in which the difference of the luminous density is at least 0.35 per 10 mm of the distance in the vertical direction. This light shielding material is advantageously used for glare-reducing glasses, glare-reducing filters, visors and the like.

REFERENCES:
patent: 1865691 (1932-07-01), Hill
patent: 3512880 (1970-05-01), Alexander et al.
patent: 3664733 (1971-05-01), Kalkowski
patent: 4076395 (1978-02-01), Deeg et al.
patent: 4080051 (1978-03-01), Krohn et al.
Brit. J. Physiol. Opt., 24(3) 161 (1967), p. 180.

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