What does Amblyopia, nocturnal mean?

Amblyopia, nocturnal meaning in Medical Dictionary

Amblyopia refers to blindness so nocturnal amblyopia is, actually, night blindness. Listed in medical dictionaries under "Nyctalopia" from Greek nyct (night) + aloas (obscure or blind) + opsis (vision), the condition involves impaired sight in dim light as well as in the dark due to impaired function of certain vision cells (specifically, the rods) into the retina.