Abstract
SUMMARY Prolonged monocular occlusion has been thought by many to be a demonstration of Bell's phenomenon. The following points are used as evidence to show that this cannot be true, and that prolonged occlusion does reveal a latent heterophoria by bringing prolonged relief to the task of maintaining fusion: 1. Insufficient evidence by Abraham, by using only six cases of prolonged occlusion upon which to base his premise. 2. Common misconceptions of Bell's phenomenon. 3. Hering's law gives good evidence to prove that prolonged occlusion deals with an entirely different function than that known as Bell's phenomenon. 4. Statistical evidence of 201 cases of occlusion showing that less than 50 per cent. react as did Abraham's six cases—that of a hyperphoria following occlusion of each eye.
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