POLAROID SCOTOMETER - A NEW DEVICE TO CHART SUPPRESSION SCOTOMAS

Suppression, an active inhibition of vision in one eye under binocular conditions, is a sensory adaptation in concomitant strabismus. The ch aracteristics and extent of suppression differ not only in different t ypes of strabismus but also in the same type under different testing c onditions, which may differ in their degree of dissociation. The findi ngs in exodeviations have thus varied from regional suppression to hem iretinal trigger, and in esodeviations from two point scotoma to singl e large scotoma. There is a need for a simple but less dissociative te st to chart the fields under binocular conditions. We have devised a n ew, simple instrument based on polaroid dissociation. The findings cor roborate the findings of more sophisticated tests like phase-differenc e haploscope.