Hem`e*ra*lo"pi*a (?), n. [NL., fr. Gr. , the opposite of ; day + of . See Nyctalopia.] Med.
A disease of the eyes, in consequence of which a person can see clearly or without pain only by daylight or a strong artificial light; day sight.
⇒ Some writers (as Quain) use the word in the opposite sense, i. e., day blindness. See Nyctalopia.
© Webster 1913.