A refractive error of the eye in which light does not focus properly on the retina, causing blurred vision at certain distances; a state of needing vision correction.
From Greek 'a-' (not) + 'metron' (measure, proper) + '-opia' (condition of vision). This medical term developed in 19th-century ophthalmology as optometry became a scientific discipline.
Most people think their eyes are 'broken' if they need glasses, but ametropia isn't a disease—it's just a shape variation, like having curly hair instead of straight; humans have more variation in eyeball shape than in almost any other body part.
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