Optometry is a health care profession concerned with the health of the eyes and related structures, as well as vision, visual systems, and vision information processing in humans. Optometrists (also known as ophthalmic opticians outside the United States and Canada) are licensed medical professionals trained to prescribe and fit lenses to improve vision, and to diagnose and treat various eye diseases. In the United States and Canada optometrists are considered Doctors of Optometry and are held to the same legal standards as any physician. In all U.S. states optometrists are licensed to diagnose and treat diseases of the eye through topical diagnostic and therapeutic drugs and oral drugs in 47/50 states. Doctors of Optometry are also able to perform certain types of laser surgery in some states. In other countries patients are referred to other healthcare professionals, such as ophthalmologists, neurologists and general medical practitioners for further treatment or investigation.

Die Optometrie ist die Teildisziplin der Augenoptik, die Fehlsichtigkeiten korrigiert. Sie umfasst die biologische und physikalische Optik. Die Grundlagen für die Fach- und Hochschulausbildung auf dem Gebiet der Optometrie wurden in Deutschland maßgeblich durch Hermann Pistor entwickelt.

L'optométrie désigne l'ensemble des techniques et des procédés permettant de déterminer les différentes formes d'amétropie.

Optometria - (gr. optos – widziany i metreo – mierzenie) dziedzina wiedzy stosowanej, zajmująca się procesem widzenia, a szczególnie ochroną, usprawnieniem, zachowaniem i rozwojem tego procesu.

L’optometrista è un professionista sanitario non medico che svolge la sua attività nel campo dell’optometria e dell'ottica fisiologica, della refrazione, delle lenti a contatto, della rieducazione visiva e dell'ipovisione.