The
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc. says it can mean either
Night or
Day Blindness.
Quote:
nyctalopia
\Nyc`ta*lo"pi*a\, n. [L. nyctalopia, fr. nyctalops a nyctalops, Gr. ?. Gr. ? meant, a person affected either with day blindness or with night blindness, and in the former case was derived fr. ?, ?, night + ?, ?, the eye; in the latter, fr. ? + ? blind + ?.] (Med.) (a) A disease of the eye, in consequence of which the patient can see well in a faint light or at twilight, but is unable to see during the day or in a strong light; day blindness. (b) See Moonblink.
Do we know the actual dictionary and version CAS used?