glossary

Fluid pressure exerted inside the eyeball (ocular globe), which keeps the wall taut.

Circular membrane that delimits the pupil. The iris acts as a diaphragm that contracts according to the intensity of light. Pigmented tissue lying behind the cornea that gives color to the eye (e.g., blue eyes) Controls light by contracting and constricting the opening (pupil).

A common type of color vision test that can help determine general and specific inherited color vision deficits. It consists of a series of color plates in which the test taker is asked to identify numbers or geometric shapes composed of specific colors that are hidden within a field of spots of very similar colors. People with normal color vision can see the numbers or geometric figures while people with abnormal color vision cannot. See Ishihara Test Ishihara