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The following is a reply to Dr. Leigh's letter, solicited by the Editor:
To the Editor:
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'" (Brain 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, Arch Neurol Psychiat 55:299-319, 1946.)The unusual persistence of after-images to which Dr. Leigh has referred suggests the possibility of a
Hoyt WF. PERSISTENT AFTER-IMAGES, A CLINICAL SYMPTOM-Reply. Arch Ophthalmol. 1965;74(2):293. doi:10.1001/archopht.1965.00970040295043