Nyctalopias

Part of speech: noun

Definitions

1. A condition characterized by the ability to see in low light or darkness, often a trait in certain animals
2. a visual impairment in humans that affects night vision
3. the phenomenon whereby some species have adaptations allowing them to navigate through nocturnal environments with clarity

Etymology: "Nyctalopias" is simply the plural of "nyctalopia," a noun for impaired vision in dim light. The single form is borrowed from Ancient Greek "nuktalōpía," which combines "núx" (night) with "alaós" (blind) and "óps" (eye). Literally, it describes an eye that is blind at night. The Greek compound is older than its English use, but the sense was consistent from the start: the word names a condition where the eyes cannot see well once the light fades. Its parts are transparent, so a reader who knows "nocturnal" or "optic" can work out most of it at a glance.

Synonyms: night blindness