A usually congenital condition in which someone is able to see better in bad light than in ordinary daylight.
Abnormal condition in which bright light causes a blurring of vision; a side effect of some anticonvulsant drugs; also called day blindness.
Diminished vision in bright light. The term formerly was erroneously applied to night blindness or nyctalopia. Nyctalopia indicates inability to see in dim light, though vision is normal otherwise.