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strabismus

(Encyclopedia)strabismus strəbĭzˈməs [key], inability of the eyes to focus together because of an imbalance in the muscles that control eye movement; also called squint. It is a consequence of weakness or uneve...

ophthalmoscope

(Encyclopedia)ophthalmoscope ŏfthălˈməskōpˌ [key], instrument used for examining the inner structure of the eye. The device was invented by the German physiologist H. L. F. von Helmholtz in 1851. His model co...

optometry

(Encyclopedia)optometry ŏptŏmˈətrē [key], eye-care specialty concerned with eye examination, determination of visual abilities, diagnosis of eye diseases and conditions, and the prescription of lenses and othe...

sclera

(Encyclopedia)sclera: see eye.

cornea

(Encyclopedia)cornea: see eye.

pupil

(Encyclopedia)pupil: see eye.

iris, in anatomy

(Encyclopedia)iris: see eye.

ocellus

(Encyclopedia)ocellus (pl. ocelli): see eye.

contact lens

(Encyclopedia)contact lens, thin plastic lens worn between the eye and eyelid that may be used instead of eyeglasses. Actors, models, and others wear them for appearance, and athletes use them for safety and conven...

Gullstrand, Allvar

(Encyclopedia)Gullstrand, Allvar älˈvär gŭlˈstränd [key], 1862–1930, Swedish ophthalmologist. He was professor (1894–1927) successively of eye therapy and of optics at the Univ. of Uppsala. He applied the...