Color Perception in Central Achromatopsia

Central achromatopsia is a defect of color perception caused by damage in the visual cortex in which subjects complain the world looks dull, dirty, faded, grey, washed out, or like a black and white TV. Because the defect usually affects a quadrant or hemifield and spares fixation, the region where standard color probes are viewed Its psychophysical underpinnings remain poorly defined.