Vision Diseases, Disorders & Definitions

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I Definitions


Plastic lens that may be implanted during cataract surgery to replace the eye's natural lens.

Intraocular pressure:

Fluid pressure inside the eye. Measured with a tonometer. The pressure is usually abnormally high in Glaucoma.


Pigmented tissue lying behind the cornea that gives color to the eye (e.g. blue eyes) and controls amount of light entering the eye by varying the size of the pupillary opening.


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.