[Anomalous bilateral single vision in cases of severe squint deviation: investigations with Bagolini glasses...

Twenty patients with concomitant strabismus, ARC and a horizontal deviation of between 10 and 30 degrees (13 convergent, seven divergent) were examined with striated glasses to determine areas of anomalous simultaneous binocular vision. Such an area was found in a zone between the visual field centers of the two eyes in 18 cases. On the basis of these findings the authors suspect that harmonious ARC permits anomalous binocular vision only in field areas where retinal points with identical images have no significant difference in function. In the other areas of the binocular visual field, ARC provides for optimal perception of detail by suppression of the more peripherally situated retinal point.