refractive quality

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• Refractive surgery — Refractive eye surgery is any eye surgery used to improve the refractive state of the eye and decrease or eliminate dependency on glasses or contact lenses. This can include various methods of surgical remodeling of the cornea or cataract surgery …   Wikipedia

• Refractive index — Refraction of light at the interface between two media. In optics the refractive index or index of refraction of a substance or medium is a measure of the speed of light in that medium. It is expressed as a ratio of the speed of light in vacuum… …   Wikipedia

• Council for Refractive Surgery Quality Assurance — The Council for Refractive Surgery Quality Assurance (CRSQA, USA Eyes ) is an independent, nonprofit, patient/consumer health organization that provides detailed information about LASIK and certifies refractive surgery doctors based upon patient… …   Wikipedia

• flint glass — Optics. an optical glass of high dispersion and a relatively high index of refraction, composed of alkalis, lead oxide, and silica, with or without other bases, sometimes used as the diverging lens component of an achromatic lens. [1665 75] * * * …   Universalium

• Stained glass — For the Blackford Oakes novel, see Stained Glass (novel) The term stained glass refers either to the material of coloured glass or to the art and craft of working with it. Throughout its thousand year history the term stained glass was applied… …   Wikipedia

• Clayton and Bell — From Peterborough Cathedral Clayton and Bell was one of the most prolific and proficient workshops of English stained glass during the latter half of the 19th century.[1] The partners were John Richard Clayton (London, 1827–1913) and Alfred Bell… …   Wikipedia

• Light — For other uses, see Light (disambiguation). Visible light redirects here. For other uses, see Visible light (disambiguation) …   Wikipedia

• Georg Friedrich Strass — (May 29, 1701, Wolfisheim bei Strasbourg December 22, 1773) was an Alsatian jeweler and inventor of imitation gemstones. He is best known as the inventor of the rhinestone, called strass in many European languages, from a particular type of glass …   Wikipedia

• Double-clad fiber — Refractive index profile of dispersion compensating double clad fiber. c:core, i:inner cladding, o:outer cladding …   Wikipedia

• Calculation of glass properties — [ refractive index. [ [http://glassproperties.com/refractive index/ Calculation of the Refractive Index of Glasses] ] ] The calculation of glass properties (glass modeling) is used to predict glass properties of interest or glass behavior under… …   Wikipedia

• refractivity — Refractive power. SYN: refringency. * * * re·frac·tiv·i·ty .rē .frak tiv ət ē, ri n, pl ties the ability of a substance to refract light expressed quantitatively specif the index of refraction minus one * * * re·frac·tiv·i·ty (re″frak… …   Medical dictionary