[Central physiologic relative scotoma after dark adaptation]

The paper describes data on conditions for appearance of a physiologic central retinal scotoma of dark adaptation. Examinations of 80 eyes with normal visual functions have shown that central scotoma of dark adaptation is revealed in conditions of scotopic illumination 20-25 minutes after dark adaptation. The optimal duration of dark adaptation is 40-45 minutes. More frequently scotoma is displaced upwards from the point of fixation, its sizes varying from 4 degrees to 10 degrees by the horizontal meridian and from 3 degrees to 8 degrees by the vertical meridian. The presence of this scotoma should be considered when examining the state of the visual analyser in conditions of scotopic illumination. This can play a certain role in differential diagnostics of clinical ophthalmopathology.