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Safilo Group S.p.A. (acronym of Società Azionaria Fabbrica Italiana Lavorazione Occhiali) is an Italian company that designs, produces, and distributes prescription frames, sunglasses, sports eyewear, ski goggles and helmets, and cycling helmets under its own five house brands and 32 licensed brands, including Smith Optics since 1996.
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Warren J. Smith (1922-2008) was president of the Optical Society of America in 1980. [1] Warren Smith is world-renowned in the optics community as author of two editions of Modern Optical Engineering - The Design of Optical Systems, Modern Lens Design - A Resource Manual and Practical Optical Systems Layout. He was a Founder and President of ...
Near visual acuity or near vision is a measure of how clearly a person can see nearby small objects or letters.Visual acuity in general usually refers clarity of distance vision, and is measured using eye charts like Snellen chart, LogMAR chart etc. Near vision is usually measured and recorded using a printed hand-held card containing different sized paragraphs, words, letters or symbols.
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The scale numbers range from LB1 to LB10, where the number is a lower limit for the optical density, i.e. LBn means that OD > n, or <, where T is the transmittance. The minimum scale number for a given laser with a beam diameter of 1 mm depends on the working mode and the wavelength as follows (EN 207:2017):
Double lens anti-fog ski goggles were invented and patented by Robert Earl "Bob" Smith. [3] [4] [5] Visible Light Transmission (VLT) or S value describes the percentage of light allowed through the lens. [6] Astronomy and meteorology: dark adaptor goggles are used before going outside at night, in order to help the eyes adapt to the dark.
Smith diagram or Smith diagramme may refer to: Smith chart , a diagram by American electrical engineer Phillip Hagar Smith, used in electrical engineering Smith fatigue strength diagram [ de ] , a diagram by British mechanical engineer James Henry Smith [ de ] , used in mechanical engineering