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From The Collaborative International Dictionary of English v.0.48:
Hemeralopia \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. [1913 Webster] Note: Some writers (as Quain) use the word in the opposite sense, i. e., day blindness. See Nyctalopia. [1913 Webster]