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retinitis pigmentosa

[pig-men-toh-suh, -muh n-] /ˌpɪg mɛnˈtoʊ sə, -mən-/
noun, Ophthalmology
1.
degeneration of the retina manifested by night blindness and gradual loss of peripheral vision, eventually resulting in tunnel vision or total blindness.
Origin
1860-1865
1860-65; < Neo-Latin: pigmentary retinitis. See pigment, -ose1
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for retinitis pigmentosa

retinitis pigmentosa

/ˌpɪɡmənˈtəʊsə/
noun
1.
a degenerative hereditary disease of the human eye, characterized by pigmentary changes in the retina, night blindness, and eventual loss of vision
Word Origin
C19: pigmentosa, feminine of Latin pigmentosus
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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retinitis pigmentosa in Medicine

retinitis pigmentosa retinitis pig·men·to·sa (pĭg'mən-tō'sə, -měn-)
n.
A hereditary degenerative disease of the retina, producing conditions such as night blindness, pigmentation changes in the retina, narrowing of the visual field, and the eventual loss of vision. Also called pigmentary retinopathy, tapetoretinal retinopathy.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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retinitis pigmentosa in Science
retinitis pigmentosa
  (rět'n-ī'tĭs pĭg'měn-tō'sə)   
A hereditary degenerative disease of the retina, characterized by difficulty seeing at night, pigmentary changes within the retina, and eventual loss of vision.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for retinitis pigmentosa

group of hereditary eye diseases in which progressive degeneration of the retina leads to severe impairment of vision. In the usual course of disease, the light-sensitive structures called rods-which are the visual receptors used in dim light-are destroyed early on, causing night blindness in youth. Over time, further atrophy of the retina and changes in the layer of supporting cells known as the pigment epithelium occur. Commonly the field of vision becomes constricted until the affected person sees objects as if looking through a tunnel.

Learn more about retinitis pigmentosa with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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