photochromic lenses

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• Photochromic lens — Photochromic lenses are lenses that darken on exposure to UV radiation. Once the UV is removed (for example by walking indoors), the lenses will gradually return to their clear state. Photochromic lenses may be made of either glass or plastic.… …   Wikipedia

• photochromic — pho·to·chro·mic .fōt ə krō mik adj 1) capable of changing color on exposure to radiant energy (as light) <eyeglasses with photochromic lenses> 2) of, relating to, or utilizing the change of color shown by a photochromic substance <a… …   Medical dictionary

• Glasses — Glasses, also called eyeglasses or spectacles, are frames bearing lenses worn in front of the eyes, normally for vision correction, eye protection, or for protection from UV rays.Modern glasses are typically supported by pads on the bridge of the …   Wikipedia

• Photochromism — is the reversible transformation of a chemical species between two forms by the absorption of electromagnetic radiation, where the two forms have different absorption spectra. [ [http://pubs.acs.org/journals/chreay/thematic/00/photo.html Chemical …   Wikipedia

• Sunglasses — For the Divine Brown song, see Sunglasses (song). Wearing sunglasses under direct sunlight: Large lenses offer good protection, but broad temple arms are also needed against stray light from the sides. Sunglasses or sun glasses are a form of… …   Wikipedia

• Glass coloring and color marking — may be obtained by 1) addition of coloring ions,[1][2] by 2) precipitation of nanometer sized colloides (so called striking glasses[1] such as ruby gold [3] or red selenium ruby ),[2] 3) by colored …   Wikipedia

• Silver chloride — chembox new ImageFile = Silver chloride 3D ionic.png ImageSize = IUPACName = Silver(I) chloride OtherNames = Silver chloride; cerargyrite; chlorargyrite; horn silver Section1 = Chembox Identifiers Abbreviations = CASNo = 7783 90 6 EINECS =… …   Wikipedia

• Ezriel Auerbach — Rabbi Ezriel Auerbach (also known as Azriel Auerbach) is a prominent Haredi rabbi and Posek [See And From Jerusalem, His Word by Hanoch Teller (Feldheim 1995) (hereafter Teller ), lengthy photo caption (unpaginated) following p. 264.] who lives… …   Wikipedia

• spectacles — Lenses set in a frame that holds them in front of the eyes, used to correct errors of refraction or to protect the eyes. The parts of the s. are the lenses; the bridge between the lenses, resting on the nose; the rims or frames, encircling the… …   Medical dictionary

• photography, technology of — Introduction       equipment, techniques, and processes used in the production of photographs.  The most widely used photographic process is the black and white negative–positive system (Figure 1 >). In the camera the lens projects an image of… …   Universalium

• Optics — For the book by Sir Isaac Newton, see Opticks. Optical redirects here. For the musical artist, see Optical (artist). Optics includes study of dispersion of light. Optics is the branch of …   Wikipedia