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A small channel near the root of the iris which extends round the circumference of the eye. The trabecular meshwork filters aqueous into it, and from it the aqueous drains into veins which leave the eye.

A group of genetic eye conditions leading to chronic retinal degeneration, accompanied by abnormal deposits of pigment. The disease causes a progressive decrease in peripheral or side vision. Associated with night blindness, loss of peripheral vision, tunnel vision, decreased acuity, lack of depth perception, retinal scarring, and photophobia.

A test to determine the refractive state of the eye, and the best corrective lenses required to aid in clear vision. A series of lenses in graded powers are offered to determine which provide sharpest, clearest vision.