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the practice or profession of examining the eyes, by means of suitable instruments or appliances, for defects in vision and eye disorders in order to prescribe corrective lenses or other appropriate treatment.

1890–95; opto- + -metry

optometrical [op-tuh-me-tri-kuhl] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
optometry (ɒpˈtɒmɪtrɪ)
the science or practice of testing visual acuity and prescribing corrective lenses

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1886, from optometer (1738), an instrument for testing vision, from opto- "sight," from Gk. optos "seen, visible" + Gk. metron "measure" (see meter (2)). Probably influenced by Fr. optométrie.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

optometry op·tom·e·try (ŏp-tŏm'ĭ-trē)
The health care profession concerned with examination, diagnosis, and treatment of the eyes and related structures, and with determination and correction of vision problems using lenses and other optical aids.

op·tom'e·trist n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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