noun Ophthalmology.
the normal refractive condition of the eye, in which the rays of light are accurately focused on the retina.

1860–65; < Neo-Latin, equivalent to emmetr- (stem of Greek émmetros in measure, equivalent to em- em-2 + métr(on) measure + -os adj. suffix) + -opia -opia

emmetrope, noun
emmetropic [em-i-trop-ik, -troh-pik] , adjective
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World English Dictionary
emmetropia (ˌɛmɪˈtrəʊpɪə)
the normal condition of perfect vision, in which parallel light rays are focused on the retina without the need for accommodation
[C19: from New Latin, from Greek emmetros in due measure + -opia]

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American Heritage
Medical Dictionary

emmetropia em·me·tro·pi·a (ěm'ĭ-trō'pē-ə)
The condition of the normal eye when parallel rays are focused exactly on the retina and vision is perfect.

em'me·trop'ic (-trŏp'ĭk, -trō'pĭk) adj.
The American Heritage® Stedman's Medical Dictionary
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