Webster’s Revised Unabridged Dictionary · 1913
Hemeralopia
Hem′e·ra·lo′pi·a (hĕm′ē·rȧ·lō′pĭ·ȧ or hē′mē·), n. [NL., fr. Gr. ἡμεράλωψ, the opposite of νυκτάλωψ; ἡμέρα day + τάλωψ of νυκτάλωψ. 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.