Protective filter lenses

Details Protective filter lenses Protective filter lenses

1993-02-22

1995-01-10

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

65 37, 351177, G02C 710, C03B 1108

Patent

active

053811933

ABSTRACT:
An ophthalmic protective filter lens having a scotopic transmittance lower than the photopic transmittance by more than a factor of two, a dominant wavelength within the ranges of 580-605 nm and a color purity of 75-85 whereby colors perceived through the lens are approximately those of the scene being viewed. A method of producing an ophthalmic protective filter lens which comprises firing a photochromic glass lens in a hydrogen-containing atmosphere within the temperature range of 400.degree.-430.degree. C. for a time of 1-8 hours to impart a scotopic transmittance lower than the photopic transmittance by a factor of at least two, a dominant wavelength within the ranges of 580-605 nm and a color purity of 75-85 whereby colors perceived through the lens are approximately those of the scene.

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