Ultraviolet radiation and blue light blocking polarizing lens

Details Ultraviolet radiation and blue light blocking polarizing lens Ultraviolet radiation and blue light blocking polarizing lens

1989-10-13

1993-01-05

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

With antiglare or shading

351 49, G02C 710, G02C 712

Patent

active

051775093

ABSTRACT:
A lens (10) that substantially blocks horizontally polarized light and selectively blocks wavelengths between 300 and 549 nanometers. The selective blocking is controlled by a sharp cut-on filter (14) selected to cut-on at either 450, 500, 515, 530, or 550 nanometers. The specific blocking and cut-on point selected is dependent upon the ultimate usage/environment of the lens (10). If a 450 cut-on filter is selected, wavelengths between 300 and 449 nanometers are blocked before a cut-on occurs at 450 nanometers; similarly, a 550 cut-on filter blocks wavelengths between 300 and 549 nanometers before a cut-on occurs at 550 nanometers. The lens (10) also allows 30 to 40 percent of wavelengths over 625 nanometers to be transmitted. The filter (14) in combination with the polarizer (16) blocks harmful Ultraviolet radiation and blue light. While a beneficial and calming effect is achieved by wearing only blue-blocking lenses, the addition of the polarizer (16) substantially enhances the calming effect and the improvement of vision without visual discomfort.

REFERENCES:
patent: 2370697 (1945-03-01), Tillyer
patent: 4043637 (1977-08-01), Hovey
patent: 4952046 (1990-08-01), Stephens et al.
Hadrnon Inc, "Model 112 Safety Goggles sharpen viewing in Ultraviolet radiation Field"-1968.
Emsley "Filters: Absorptive And Thin Film" The Optician vol. 137 No 3559, Jun. 19, 1959.

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