Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.
Definition of Nyctalopia
Medically reviewed by Min Clinic Staff | Updated: January 2026
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.