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Tinted lenses (e.g. Pilestone [6] /Colorlite [7] /ColorMax [8] glasses) apply a tint (e.g. magenta) to incoming light that can distort colors in a way that makes some color tasks easier to complete. These glasses can circumvent many colorblind tests, though wearing them during testing is typically not allowed. [9]
Opticians may recommend "anti-reflection lenses" because the decreased reflection enhances the cosmetic appearance of the lenses. Such lenses are often said to reduce glare, but the reduction is very slight. [3] Eliminating reflections allows slightly more light to pass through, producing a slight increase in contrast and visual acuity.
The lenses typically give the wearer's vision a brown or grey tint. The mirror coating decreases the amount of light passing through the tinted lens by a further 10–60%, making it especially useful for conditions of sand, water, snow, and higher altitudes. Mirrored sunglasses are one-way mirrors. [citation needed]
The Doge and other well-off Venetians, such as possibly Goldoni, sported, in the late 18th century, so-called "goldoni glasses," tinted pairs of spectacles with pieces of cloth as sun guards on the sides of the glasses. [13] [11] James Ayscough began experimenting with tinted lenses in spectacles around 1752. These were not "sunglasses" as that ...
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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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