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A condition of “dark adaptation” that is used in retinal testing such as the electroretinogram. Dark adaptation is accomplished by placing black goggles over the patient’s eyes for a predetermined period of time (usually about 30 minutes). This can be useful for determining health of “rods,” or the dim light-detecting cells in the retina.

An area of partial alteration in the field of vision with partially diminished or entirely degenerated visual acuity which is surrounded by a field of normal vision.

The ?white? of the eye. It forms the wall of the eye, except in the region of the cornea.