Century Dictionary and Cyclopedia
- n. The common name for the visual defect by which objects are seen distinctly only by a dim light: the opposite of daysight. Also called night-sight, nocturnal sight, and by medical writers either hemeralopia or nyctalopia, according to their definition of these words.
- n. The state or quality of being day-blind.
“Hemeralopia (etymologically day-blindness, but by common usage meaning day-vision or night-blindness) is a symptom of a peculiar degenerative disease of the retina, called retinitis pigmentosa.”
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