Colored plastic lens reducing visual noise for VDT viewers
OwnerMichael L. Coheninventor
Life of this patent
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Abstract
A lens reduces eye strain and fatigue due to glare, after images, reflections or other visual noise incident upon an observer of a visual display terminal. The lens includes a light transmitting plastic body having a convex shaped outer surface for deflecting stray angular radiation and a body provided, in combination with, an ultraviolet absorber to block the transmission of ultraviolet radiation, a colored dye to diminish the intensity of any fluorescent light incident upon the lens and to diminish the transmission of either or both green color radiation or yellow color radiation through the lens and a grey dye to reduce the transmission of incident light.
Claims19
The method of producing a lens for wear by a user to avoid eye strain generated by visual noise, said method comprising:
- providing a plastic body forming a light transmitting lens having a geometric shape including a front surface of a +1 to +8 diopter curvature,
- applying to said lens an aqueous ultraviolet radiation absorber composition or dispersion which causes said lens to block 85 to 100% of ultaviolet component of incident light,
- applying to said lens a colored dye mixture which causes said lens to block 10-40% of incident light having a 500-600 nm wavelength, said colored dye mixture comprising an aqueous dispersion of red disperse dyes or of blue disperse dyes or of red and blue disperse dyes, and
- applying to said lens a grey mixture of dyes which causes the lens to block 20-30% of incident which light, said grey dye comprising a dispersion of at least one or more of the group selected from black, blue, violet, orange, and yellow disperse dyes.
Dependencies are inferred from the claim text.