The ophthalmologist frequently fails to give his patient comfortable binocular vision in spite of the fact that he has adequately corrected errors of refraction and motility and has eliminated the possibility of ocular disease and inflammation. The reason for this may be that some disorder of binocular vision is at fault. Of interest, therefore, is a report of the results obtained in a series of cases studied at the Dartmouth Eye Institute in which monocular occlusion was used for the purpose of determining whether binocular anomalous vision was at fault.
The chief disorders affecting the comfortable and efficient cooperation of the two eyes in binocular vision are heterophoria, accommodation-convergence imbalance and aniseikonia. Binocular single vision is not present in cases of strabismus, and symptoms in such cases cannot be due to disorders of the binocular processes. On the contrary, correction of the deviation and restoration of binocular vision may result