complete achromatopsia

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• Achromatopsia — Classification and external resources A person with complete achromatopsia would see only black, white and shades of grey. Additionally, the image would usually be blurry in brighter light (in the brightest light, effectively invisible) but would …   Wikipedia

• Achromatopsia — An hereditary disorder of sight due to a lack of cone vision that type of vision provided by the cone photoreceptors in the retina. In the normal eye, there are some 6 million cone photoreceptors; they are located largely in the center of the… …   Medical dictionary

• achromatopsia, achromatopsy — This is the compete form of a., characterized by severe deficiency of color perception, associated with nystagmus, photophobia, reduced visual acuity, and “day blindness”; autosomal recessive inheritance, caused by …   Medical dictionary

• achromatopsia — n. the inability to differentiate different shades of colour. Such complete colour blindness is very rare and is usually associated with poor visual acuity, nystagmus, and sensitivity to bright light. It is usually determined by hereditary… …   The new mediacal dictionary

• Cerebral achromatopsia — is a type of color blindness that is caused by damage to the cerebral cortex of the brain, rather than abnormalities in the cells of the eye s retina. It is often confused with congenital achromatopsia.[1] Cerebral achromatopsia differs because… …   Wikipedia

• Congenital achromatopsia — An hereditary disorder of vision characterized by a lack of cone vision (sight provided by the cone photoreceptors in the retina). People with achromatopsia (achromats) are completely or almost completely colorblind. They have poor visual acuity …   Medical dictionary

• Pingelap — is an atoll in the Pacific Ocean, part of Pohnpei state of the Federated States of Micronesia, consisting of three islands: Pingelap Island, Sukoru and Daekae, linked by a reef system and surrounding a central lagoon, although only Pingelap… …   Wikipedia

• Monochromatism — 1) Total inability to perceive color. A person with true monochromatism perceives only black, white, and shades of gray. It is due to lack of or damage to the cones of the eye that perceive color, or to inability of the nerves to translate… …   Medical dictionary

• Founder effect — In population genetics, the founder effect refers to the loss of genetic variation when a new colony is established by a very small number of individuals from a larger population. It was first fully outlined by Ernst Mayr in 1952 [Provine, W.B.… …   Wikipedia

• Cyclic nucleotide-gated ion channel — Cyclic nucleotide gated (CNG) ion channels are ion channels that function in response to the binding of cyclic nucleotides. CNG channels are nonselective cation channels that are found in the membranes of various types of cells. Signal… …   Wikipedia

• monochromatic vision — complete lack of color vision, so that all colors of the spectrum appear as neutral grays with varying shades of light and dark. Called also achromatism, achromatopsia, monochromatism, monochromatopsia, and, popularly, complete or total color… …   Medical dictionary