A new binocular scotometer

A new method of binocular scotometry is described based on an intriguing binocular phenomenon and using a new binocular scotometer and a retinoscope with its head reversed. Shortcomings in previous attempts have been corrected by objectively aligning a "blind" eye with the center of a translucent opalescent screen. This was made possible by having the patient rotate the retinoscope to induce conjugate eye movements in cases of manifest eye deviation. The examiner could then observe the "blind" eye directly through a central opening in the screen, by reinforced assistance through dependence on the corneal light reflex and, if necessary, by circumferential plotting.