permanent lens.

permanent lens.

Useful english dictionary. 2012.

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  • permanent lens. — See intraocular lens. * * * …   Universalium

  • intraocular lens — noun an artificial lens that is implanted into the eye of someone to replace a damaged natural lens or someone who has had a cataract removed • Hypernyms: ↑lens, ↑lense, ↑lens system * * * Ophthalm. a plastic lens implanted surgically to replace… …   Useful english dictionary

  • intraocular lens — Ophthalm. a plastic lens implanted surgically to replace the eye s natural crystalline lens, usually because the natural lens has developed a cataract. Also called permanent lens. Cf. contact lens. * * * …   Universalium

  • History of the single-lens reflex camera — The history of the single lens reflex camera predates the invention of photography in 1826/27 by one and a half centuries with the use of a reflex mirror in a camera obscura first described in 1676. Such SLR devices were popular as drawing aids… …   Wikipedia

  • Canon FD 200 mm lens — Eight designs of Canon FD 200 mm lens were produced for the Canon FD lens mount. These spanned two generations (FD and New FD) and varied by aperture and macro ability. These photographic lenses were: Canon FD * 200 mm f/2.8 S.S.C.: This lens,… …   Wikipedia

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  • Field lens — Field Field (f[=e]ld), n. [OE. feld, fild, AS. feld; akin to D. veld, G. feld, Sw. f[ a]lt, Dan. felt, Icel. fold field of grass, AS. folde earth, land, ground, OS. folda.] 1. Cleared land; land suitable for tillage or pasture; cultivated ground; …   The Collaborative International Dictionary of English

  • Photography — is the art, science and practice of creating durable images by recording light or other electromagnetic radiation, either electronically by means of an image sensor or chemically by means of a light sensitive material such as photographic… …   Wikipedia

  • 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

  • eye disease — Introduction  any of the diseases or disorders that affect the human eye (eye, human).       This article briefly describes the more common diseases of the eye and its associated structures, the methods used in examination and diagnosis, and the… …   Universalium

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