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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.
Photochromism. A photochromic eyeglass lens, after exposure to sunlight while part of the lens remained covered by paper. Photochromism is the reversible change of color upon exposure to light. It is a transformation of a chemical species ( photoswitch) between two forms by the absorption of electromagnetic radiation ( photoisomerization ...
Charles Chevalier 's Paris optical firm produced lenses for both Niépce and Daguerre for their experiments in photography. In 1829 [ 3][citation needed], Chevalier created an achromatic lens (a two-element lens made from crown glass and flint glass) to cut down on chromatic aberration for Daguerre's experiments.
Photosensitive glass vase. Photosensitive glass, also called photostructurable glass ( PSG) or photomachinable glass, is a glass in the lithium - silicate family of glasses onto which images can be etched using shortwave radiations, such as ultraviolet. [ 1] Photosensitive glass was first discovered by S. Donald Stookey in 1937. [ 2][ 3][ 4]
Progressive lenses are corrective lenses used in eyeglasses to correct presbyopia and other disorders of accommodation. They are characterised by a gradient of increasing lens power, added to the wearer's correction for the other refractive errors. The gradient starts at the wearer's distance prescription at the top of the lens and reaches a ...
The lens focuses light in the same way as a conventional lens. Gradient-index (GRIN) optics is the branch of optics covering optical effects produced by a gradient of the refractive index of a material. Such gradual variation can be used to produce lenses with flat surfaces, or lenses that do not have the aberrations typical of traditional ...