What is the pathophysiology of color vision perception in posterior cerebral artery (PCA) stroke syndromes?

Updated: Jul 30, 2018
  • Author: Erek K Helseth, MD; Chief Editor: Helmi L Lutsep, MD  more...
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Lesions of the lingual gyrus in the inferior occipital lobe may produce disorders of color perception. Testing with Ishihara plates reveals a deficit. Colors may be described as washed out or gray. This deficit usually occurs only in the contralateral visual field and is called hemiachromatopsia.

A related problem is color anomia, also called color agnosia, in which patients can perceive and match colors but cannot associate them with the proper color names.

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