: an abnormal refractive condition (such as myopia, hyperopia, or astigmatism) of the eye in which images fail to focus upon the retina

Word History

Etymology

New Latin, from Greek ametros without measure (from a- + metron measure) + New Latin -opia — more at measure

First Known Use

1860, in the meaning defined above

Time Traveler
The first known use of ametropia was in 1860

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Cite this Entry

“Ametropia.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ametropia. Accessed 25 Mar. 2025.

Medical Definition

ametropia

noun
: an abnormal refractive eye condition (as myopia, hyperopia, or astigmatism) in which images fail to focus upon the retina
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