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13 terms

Language of Medicine: Ch 17, Pt 2

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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.