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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.
Transitions Optical is a U.S. -based company known for manufacturing photochromic lenses, which darken on exposure to specific types of light. The company was founded in 1990. [ 1] In 1991, Transitions Optical became the first company to commercialize and manufacture plastic photochromic lenses. [ 2] From inception the company has been a joint ...
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 ...
Lenticular printing is a technology in which lenticular lenses (a technology also used for 3D displays) are used to produce printed images with an illusion of depth, or the ability to change or move as they are viewed from different angles. Examples include flip and animation effects such as winking eyes, and modern advertising graphics whose ...
In 2018, Essilor announced that Transitions Optical had partnered with Johnson & Johnson Vision to make the light-adaptive photochromic technology available in a contact lens for the first time. Later that year, Time magazine named Acuvue Oasys with Transitions Light Intelligent technology the best invention of 2018. [58]
Along with optical complexity, the mechanical complexity of the Sigma, with three cells moving at differing rates, required the latest in manufacturing technology. Super-wide angle zoom lenses are even more complicated for most of today's digital SLRs, because the usually smaller-than-35mm-film-frame image sensors require much shorter focal ...