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The Actor Bifocal Reading Glasses. If you want to be able to look up and see things clearly in the distance without removing your readers, bifocals are a great option. They allow you to magnify ...
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 sunglasses when they come into contact with ultraviolet light. Most over-the-counter sunglasses do not have corrective power in the lenses; however ...
A photochromic eyeglass lens, part of the lens darkened after exposure to sunlight while the other part remained covered. A photochromic lens is an optical lens that darkens on exposure to light of sufficiently high frequency, most commonly ultraviolet (UV) radiation. In the absence of activating light, the lenses return to their clear state.
Stage-by-stage, he experiences the vision produced by single-vision and bifocal lenses, and then that of standard progressive lenses, and ultimately Varilux lenses. The world premiere of Varilux Experience marked Varilux's 50th anniversary and took place at the SILMO optical trade fair, which ran from October 30 to November 2, 2008, at Paris ...
Sometimes, and particularly in the dye industry, the term irreversible photochromic is used to describe materials that undergo a permanent color change upon exposure to ultraviolet or visible light radiation. Because by definition photochromics are reversible, there is technically no such thing as an "irreversible photochromic"—this is loose ...
The gradient starts at the wearer's distance prescription at the top of the lens and reaches a maximum addition power, or the full reading addition, at the bottom of the lens. The length of the progressive power gradient on the lens surface depends on the design of the lens, with a final addition power between 0.75 and 3.50 dioptres .
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