Optometry

very thin plastic lens worn directly on the eye to correct visual defects

clarity of vision

focusing ability of eye

Optometry (from Ancient Greek ὄψις (ópsis), meaning "eye", and μέτρον (métron), meaning "measure") is the healthcare practice concerned with examining the eyes for visual defects, prescribing corrective lenses, and detecting eye abnormalities.

series of tests assessing vision and pertaining to the eyes

alternative eyesight improvement therapy

transmissive optical device worn on the eye to improve visual perception

thumb|An eye doctor examining a patient with a keratometer thumb|Typical presentations of keratoconus as detected through a keratometer thumb|Shin Nippon Nvision K-5001 Refkeratometer A keratometer, also known as an ophthalmometer, is a diagnostic instrument for measuring the curvature of the anterior surface of the cornea, particularly for assessing the extent and axis of astigmatism. It was invented by the German physiologist Hermann von Helmholtz in 1851, although an earlier model was developed in 1796 by Jesse Ramsden and Everard Home.

chart used to measure vision

disease of the eye in response to changes in the vitreous humor or more rarely, diabetes

thumb|right|A phoropter can measure refractive error to determine an individual's spectacle lens prescription during an eye examination. thumb|right|Side of a phoropter that faces the patient

order written by an optometrist or ophthalmologist, specifying parameters of corrective lenses for a particular patient

medical imaging of the eyes

distance between the centers of the pupils of the eyes

medical imaging technique

term

Optometric treatment aimed at improving visual function

clinical test for binocular vision

individual who provides a service related to the eyes or vision

cover test to determine strabismus

thumb|right|First French Empire|French Empire gilt scissors-glasses c. 1805 thumb|right|upright|The Glasses Apostle by Conrad von Soest (1403)