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Achromatism
Achromatism is colour blindness marked by the inability to perceive any color whatsoever: Everything is seen in different shades of gray. It is a congenital condition stemming from a lack of retinal cones. When acquired as a result of brain injury, it is called cerebral achromatopsia; the typical site of injury is the ventromedial occipital cortex of the brain (see v4). Also called achromatopsia
