A doctor who tests your eyesight and can prescribe glasses or contact lenses to help you see better.
From Greek 'optos' (seen) and 'metron' (measure), literally meaning 'one who measures sight'; the profession emerged in the early 1900s as vision science developed.
Optometrists use the same basic principle as ancient Greeks—testing which lens makes distant objects clearer—but now with machines that can measure your eye to within millimeters!
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