Eye and Vision Terms

In medicine, a technique that uses low power light, fiberoptic instruments, and detectors to examine tissue.

Papilledema is swelling of the optic disc caused by raised pressure inside the skull, visible on examination of the eye.

Cancer that forms in the lymph tissue of the brain, spinal cord, meninges (outer covering of the brain), or eye (called ocular lymphoma).

Roughly a fifth of adult sleep, returning in longer and longer bouts so that it dominates the last hours before waking.

The light-sensitive layers of nerve tissue at the back of the eye that receive images and sends them as electric signals through the optic nerve to the brain.

A childhood eye cancer usually noticed as a white glow in the pupil, and the tumor that revealed how cancer genes work.

An eye exam using an instrument that combines a low-power microscope with a light source that makes a narrow beam of light.