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   Eyeglasses with divided lenses. The two parts of each lens have different strengths, allowing the wearer to focus the eye for either near or distant vision.


A pair of ophthalmic lenses in a frame or mounting which is supported by the nose and ears. The purpose is to aid or improve vision. It does not include goggles or nonprescription sun glasses for which EYE PROTECTIVE DEVICES is available.

The lens of the eye is like an adjustable lens of a camera and focuses light rays on to the retina for sharp images. A condition called presbyopia occurs when the lens is no longer able to adjust for objects at different distances.

The sense of sight.



A condition that results from rapidly decreasing atmospheric pressure on the body. Symptoms include joint pain, chest pain, shortness of breath and coma. The condition may be fatal.

Benign familial tremor
An inherited disorder that causes a slow tremor in the hands, head and voice. It may affect only one side of the body, be worse when moving than when resting and worsen with age.

A deficiency disease caused by dietary insufficiency of vitamin B1 (thiamine). Symptoms include general weakness and painful rigidity.

A muscle having two heads. The most familiar is the large muscle in the front of the upper arm responsible for flexing the forearm.

A tooth named for the two-pointed projections on the crown.


Using both eyes at the same time. Binocular vision is the most important element of depth perception.

Bipolar affective disorder
A psychiatric disorder in which the affected person has both depressed and happy, energetic (manic) episodes. This is a newer term for manic-depressive disorder.

1. Short-term loss of vision and consciousness. 2. In an alcoholic person, loss of memory for a period of time.

Plastic surgery on the eyelid.

Buildup of watery or bloody fluid under the skin.

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