An unusual case of cerebral polyopia
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Visual perseveration is a positive visual phenomenon in which a visual image either is duplicated, persists or recurs. Three different forms of visual perseveration exist which can occur in isolation or together: illusory visual spread, palinopsia, and cerebral polyopia. Illusory visual spread occurs when a visual image is not contained within its spatial boundary. Palinopsia, which can be confused with cerebral polyopia is the perseveration of a visual image in time. An image can thus persist for seconds to even years or reappear intermittently or paroxysmally after the stimulus has been removed. On the other hand, cerebral polyopia is the perseveration of a visual image in space, resulting in the perception of multiple images from a single visual stimulus. It occurs even with a monocular viewing of each eye, distinguishing it from strabismic diplopia, but disappears when the stimulus is removed. Additionally, it is not helped by a pinhole, distinguishing it from ocular abnormalities such as cataract and refractive error. We report an unusual case of cerebral polyopia secondary to a dominant hemisphere, nonoccipital infarction with no associated visual field defects.

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