noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   The condition of perfect vision, where images are correctly brought to a focus on the retina. uncountable, usually
2. 2
   (ophthalmology) the normal refractive condition of the eye in which there is clear focus of light on the retina wordnet

Etymology

From Ancient Greek ἔμμετρος (émmetros, “in measure, proportioned”) + -opia (“vision”).

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.