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Most lenses are intended for red-green color blindness, though some lenses are also marketed for blue-yellow color blindness. All lenses are passive optical filters, so can only subtract/attenuate selective wavelengths of light. However, there are large variations on this theme: Disparate lenses: using different filters over each eye
Lenses of various colors can offer sufficient (or insufficient) UV protection. Regarding blue light, the color gives at least a first indication: Blue blocking lenses are commonly yellow or brown, whereas blue or gray lenses cannot offer the necessary blue light protection. However, not every yellow or brown lens blocks sufficient blue light.
Tinted lenses for photophobia allow for greater visual comfort. A magenta (mixture of red and blue) tint allows for best visual acuity since it protects the rods from saturation while allowing the blue cones to be maximally stimulated.
Many times the glasses do not appear to have much of a tint, or, if any, a slight yellow tint, but they may be more heavily tinted. Long hours of computer use (not blue light) may cause eye strain. [13] [16] [14] [17] Many eye symptoms caused by computer use will lessen after the usage of the computer is stopped. [13]
Common colors of confusion include blue vs. purple, yellow vs. neon green, grey vs. cyan vs. pink, red vs. orange vs. green vs. brown. [7] Neither dichromatic (protanopia or deuteranopia) users nor tritan users are targeted by EnChroma. [8] As of December 2023, EnChroma markets SuperX lenses to non-colorblind users. [9]
In borosilicate glasses rich in boron, sulfur imparts a blue color. With calcium it yields a deep yellow color. [4] Manganese can be added in small amounts to remove the green tint given by iron, or in higher concentrations to give glass an amethyst color. Manganese is one of the oldest glass additives, and purple manganese glass was used since ...
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GQ Calls it the Netflix of Eyewear - Huffington Post