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Chapter 9

Parts of the Eye

TermDefinition
Sclera The tough outermost connective tissue layer that protects the eye.
Cornea Refracts and bends light rays.
Choroid A layer of blood vessels that covers the eye.
Ciliary body Holds the lens in place.
Ciliary muscle Changes the shape of the lens to accommodate for near or far vision.
Iris Regulates entrance of light into the retina.
Pupil The opening in the iris that allows light into the eye.
Retina The layer in the back of the eye that contains receptors that detect light.
Rods Receptors found in the retina that detect black and white. Rods are used in low light conditions for vision.
Cones Receptors found in the retina that allow for color vision.
Fovea centralis The point in the retina that contains the highest concentration of cones. This allows for very acute vision.
Optic nerve The nerve that transmits visual signals to the brain.
Lens Bends light to help focus light rays for precise vision.
Suspensory ligaments Supports the lense and attaches the lenses to the ciliary body.
Aqueous humor A transparent fluid that fills the anterior (front) of the eye. This fluid helps transmit light rays.
Vitreous humor A transparent fluid that fills the posterior (back) of the eye that aids in transmiting light rays and providing support.
Created by: Mr.Klein
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