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illustration Emmetropia



Part of speech: noun

Origin: Latin, 19th century


The normal condition of the eye.

Examples of Emmetropia in a sentence

"The ophthalmologist told Lesley she had emmetropia and wouldn’t need glasses."

"Emmetropia is a prerequisite for a number of jobs, including firefighter and air traffic controller."

About Emmetropia

“Emmetropia” was coined by joining the ancient Greek “ἔμμετρος” (“émmetros,” meaning “in measure”) with the suffix‎ “-opia” (meaning “vision”).

Did you Know?

Pioneering Dutch ophthalmologist Franciscus Donders coined the term “emmetropia” in the mid-19th century to describe a state of perfect vision in the eye. Today, perfectly clear vision is a condition for a variety of jobs, most notably in aviation. While standards vary from country to country, and between commercial and military pilots, a general rule of thumb is that pilots must have 20/20 vision (meaning they can see clearly and accurately from a distance of 20 feet). Pilots need not have emmetropia naturally, however — in the U.S. and many other countries, pilots can wear corrective eyewear to achieve 20/20 vision.

illustration Emmetropia

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