trichromatism

n. normal color vision: the capacity to distinguish the three primary color systems of light–dark, red–green, and blue–yellow, attributable to the presence of all three types of photopigment. Also called trichromatopsia. See also achromatism; dichromatism; monochromatism.

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Psychology term of the day

November 17th 2024

visual field defect

a reduction in the normal extent of the visual field, characterized by partial or total blindness. This is caused by an interruption in the flow of visual impulses between the retina and the visual cortex, which may be caused by a lesion before, after, or in the optic chiasm or in all or a part of the optic radiations; it can involve tracts of one or both eyes. Each possible lesion produces a different defect.