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chromatopsia


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A form of partial blindness characterized by loss or serious impairment of all aspects of vision except colour perception, resulting in a form of misidentification exemplified by guessing that a blue vehicle in a television picture is sky in spite of its different form, relative size, and movement. The condition is occasionally found in people who suffer the effects of smoke inhalation during fires, resulting in carbon monoxide poisoning and oxygen deprivation, causing widespread damage to most areas of the visual cortex apart from blobs in Area V1 and the associated thin stripes in Area V2, both of which mediate colour perception and are more richly supplied with blood vessels than other areas of the visual cortex and therefore more likely to survive such conditions. Compare achromatopsia. chromatopsic adj. [From Greek chroma, chromatos colour + opsis sight, from ops an eye + -ia indicating a condition or quality]

Subjects: Psychology.


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