nyctalopia

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun inability to see clearly in dim light; due to a deficiency of vitamin A or to a retinal disorder

Borrowed from Ancient Greek νυκταλωπία (nuktalōpía), from νύξ (núx, “night”), ἀλαός (alaós, “blind”), and ὄψ (óps, “eye”).

The European physicians call this disease Nyctalopia (Νυκταλωπια). — Travels in the Great Desert of Sahara, in the Years of 1845 and 1846, James Richardson

night blindness, moon blindness

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