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Vision Diseases, Disorders & Definitions

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O Definitions


Physician (MD) specializing in diagnosis and treatment of refractive, medical and surgical problems related to eye diseases and disorders.


Diagnostic instrument that allows the doctor to view the retina.


Professional who makes and adjusts optical aids, e.g., eyeglass lenses, from refraction prescriptions supplied by an ophthalmologist or optometrist. The optician may also fit contact lenses in some states.

Optic nerve:

Largest sensory nerve of the eye; carries impulses for sight from the retina to the brain.


Doctor of optometry (OD) specializing in vision problems, treating vision conditions with spectacles, contact lenses, low vision aids and vision therapy as well as prescribing medications for certain eye diseases.

Oversize Lenses:

When the length (boxed) of an eyeglass lens is larger than 60mm.


Portions of this page are excerpted from Dictionary of Eye Terminology, copyright 1990-2006 by Barbara Cassin and Triad Communications. Reprinted with permission.

Some of the information above is reprinted from the National Eye Institute, National Institutes of Health, and is for educational purposes only. Superior Vision strongly recommends eye exams as the best way to diagnose eye conditions and learn more about potential vision problems.