eye, eyes +

An electronic device that allows a person to control a computer by looking at words or commands on a video screen.

A very low intensity light shines into one of the user's eyes. Reflections from the cornea and retina are picked up by a television camera.

As the direction of the person's gaze moves, the relative position of the two reflections changes, and the computer uses this information to determine th area at which the person is looking. The computer then executes the command.

1. A glass lens used to correct a defect in visual acuity or to prevent exposure to bright light if the lens is tinted.
2. A transparent refractive device worn to correct reflection errors in the patient's eyes.
3. A device worn to protect the eyes from glare or particles in the air.

A stiff hair on the margin of the eyelid.

1. One of two movable protective folds that cover the anterior surface of the eyeball when it is closed.
2. Two movable folds that cover the fronts of the eyeballs when closed; formed with fibrous cores (tarsal plates) and the palpebral portions of the orbicularis oculi muscles covered with skin on the superficial, anterior surface and lined with conjunctiva on the deep, posterior surfaces.

Rapid contraction of the contained muscle fibers produces blinking; each has fixed (orbital) and free margins, the latter separated centrally by the puopebral fissure, united at the lateral and medial palpebral commissures, and bearing eyelashes, openings of tarsal and ciliary glands and (medially) the lacrinal puncta.

The compound lens at the end of the microscope tube closest to the eye.

It magnifies the image made by the objective lens.

1. Tiredness of the eyes because of over use or the use of improper corrective lenses.
2. Pain and fatigue of the eyes, often accompanied by a headache, resulting from prolonged use of the eyes, uncorrected defects of vision, or an imbalance of the eye muscles.

Any suitable liquid material used to wash the eye; such as, sterile physiological saline or sterile water.