emmetropia
正常眼
em·me·tro·pia /ˌɛməˈtropɪə/ 名詞
屈光正常,正視眼(正常視力)
Em·me·tro·pi·a n. Med. That refractive condition of the eye in which the rays of light are all brought accurately and without undue effort to a focus upon the retina; -- opposed to hypermetropia, myopia, and astigmatism.
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emmetropia
n : (ophthalmology) the normal refractive condition of the eye
in which there is clear focus of light on the retina