The normal condition of the eye where light rays focus exactly on the retina, producing clear vision without correction.
From Greek 'emmetros' (well-proportioned) and 'ops' (eye), meaning 'properly measured eye.' This optical term describes the ideal refractive state.
Eye doctors consider emmetropia the gold standard of vision—your cornea and lens are perfectly proportioned to bend light exactly right, which is why surgeries like LASIK try to create this state.
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