Optometry is the science that deals with assessing, diagnosing, treating, and managing the eye and related structures for visual difficulties (such as nearsightedness of farsightedness) and eye disorders (such as cataracts). Cataracts is a darkening of the lens in the eye. The lens is an organ located between the colored part of the eye, that bends light as it enters the eye.

FEATURED BOOK: Clinical Procedures for Ocular Examination

Optometry is also concerned with vision testing, vision training, eye exercises, and the prescription of corrective devices such as eyeglasses and contact lenses, all for the purpose of making someone's vision the best it can possibly be. Someone who studies and practices optometry is known as an optometrist. Click here to see the difference between an optometrist and an ophthalmologist. Optometrists and ophthalmologists often work together to treat and manage patients. Both of these professionals are different from opticians, who dispenses (and sometimes construct) corrective eye wear (e.g., eyeglasses). Optometry also refers to the use of an optometer, which is a device that measures the path that light takes when it enters the eye.
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Optometry comes from the Greek word "optikos" meaning "sight," and the Greek word "metron" meaning "measure." Put the two words together and you have "measure sight."