Abstract
The following is a reply to Dr. Leigh's letter, solicited by the Editor: <h3>To the Editor:</h3> The subjective visual complaint of persistence of after-images is uncommon. When a young patient continues to describe this type of phenomenon for a year or more I become suspicious of a psychogenic problem. Episodic visual symptomatology resembling persistence of after-images may occur in patients with occipital or occipitoparietal disease. Critchley has discussed these problems in an article entitled "Types of Visual Perseveration: `Palinopsia' and 'Illusory Visual Spread'" (<i>Brain</i>74:267-299, 1951). These rare visual symptoms occur against a background of frank neurologic disease. Only rarely in such patients has the time span of the retinal after-image been abnormally prolonged. (See Bender, M.B.: "Changes in Sensory Adaptation Time and After-Sensation With Lesions of Parietal Lobe,<i>Arch Neurol Psychiat</i>55:299-319, 1946.) The unusual persistence of after-images to which Dr. Leigh has referred suggests the possibility of a
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