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Earlier types of photographic film were quite sensitive to UV light, which used to cause haziness or fogginess, and a bluish hue in color film. UV filters were used to filter out shorter ultraviolet wavelengths while remaining transparent to visible light. However, the modern-day photographic film and digital cameras are less sensitive to UV ...
Once inside, away from the triggering UV light, the cold lenses take longer to regain their transparency than warm lenses. A number of sunglass manufacturers and suppliers including INVU, BIkershades, Tifosi, Intercast, Oakley , ZEISS , Serengeti Eyewear , and Persol provide tinted lenses that use photochromism to go from a dark to a darker state.
It is not possible to "see" the protection that sunglasses offer. Dark lenses do not automatically filter out more harmful UV radiation and blue light than light lenses. Inadequate dark lenses are even more harmful than inadequate light lenses (or wearing no sunglasses at all) because they provoke the pupil to open wider.
Hackmanite before (top) and after (bottom) exposure to UV. Tenebrescence, also known as reversible photochromism, is the ability of minerals to change color when exposed to light. The effect can be repeated indefinitely, but is destroyed by heating. [10] Tenebrescent minerals include hackmanite, spodumene and tugtupite.
Sunglasses allow for better vision in bright daylight and are used to protect one's eyes against damage from excessive levels of ultraviolet light. Typical sunglasses lenses are tinted for protection against bright light or polarized to remove glare; photochromic glasses are clear or lightly tinted in dark or indoor conditions, but turn into ...
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