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In page Cerebral polyopia:

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The preliminary theory of cerebral polyopia proposed by Bender postulated that polyopia occurs as a result of instability of fixation due to occipital lobe disease.[1] Under this explanation, small, involuntary eye movements that accompanied normal fixation were the cause of polyopic images. These involuntary eye movements lead to the development of new retinal and corresponding cortical regions that code for central vision called false maculae.[2] Thus, polyopic images resulted from the stimulation of both the original and acquired maculae.[citation needed]