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fundus of the eye

Posterior, inner part of the eye.

iris

Pigmented (colored) layer that opens and closes to allow more or less light into the eye.

lens

Transparent, biconvex body behind the pupil of the eye. It bends (refracts) light rays to bring them into focus on the retina.

macula

Yellowish region on the retina lateral to and slightly below the optic disc; contains the fovea centralis, which is the area of clearest vision.

optic chasm

Point at which optic nerve fibers cross in the brain.

optic disc

Region at the back of the eye where the optic nerve meets the retina. It is the blind spot of the eye because it contains only nerve fibers, and no rods or cones.

optic nerve

Cranial nerve carrying impulses from the retina to the brain (cerebral cortex).

pupil

Central opening of the eye, surrounded by the iris, through which light rays pass.

refraction

Bending of light rays by the cornea, lens, and fluids of the eye to bring the rays into focus on the retina.

retina

Light-sensitive nerve cell layer of the eye containing photoreceptor cells (rods and cones).

rod

Photoreceptor cell of the retina essential for peripheral vision, and for vision in dim light.

sclera

Tough, white outer coat of the eyeball.

thalamus

Relay center of the brain. Optic nerve fibers pass through here on way to cerebral cortex.

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