A person whose eyes have normal vision and can focus light rays directly on the retina without needing glasses or contacts.
From Greek 'emmetros' (properly proportioned, well-measured) plus 'ops' (eye). This medical term describes eyes with perfect optical proportions.
Only about 35% of adults are true emmetropes without any refractive error—most people are slightly nearsighted, farsighted, or astigmatic, so having perfectly proportioned eyes is actually pretty special.
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