Basic phenomena in acquired colour vision deficiency

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Abstract
Acquired colour vision defects are directly related to the fixation mode: blue-yellow defects in foveolar fixation, blue-yellow or red-green defects in eccentric fixation. The primary localization of a disease can be retraced from the degree of cone damage. Optic nerve diseases essentially lack signs of cone damage. Processes at the level of the choriocapillaris/retinal pigment epithelium induce a non-selective receptor impairment. There are minor signs of cone damage. In cone dystrophies there is selective cone damage. Scotopization indicates a relatively well-preserved rod function.

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