Nyctalopia: Night blindness, impaired vision in
dim light and in the dark, due to impaired function of
certain specialized vision cells (the rods) in the retina.
"Nyctalopia" comes from the Greek "nyct" (night) + "aloas"
(obscure or blind) + "opsis" (vision). Nyctalopia is
also called day sight, nocturnal amblyopia, and nyctanopia.