Eye Lab Study Guide

What does the eye contain?

Photoreceptors, modified neurons located on its inner while

What do the other parts of the eye provide?

Protective functions

Make it possible to move the eyeball

What do other structures of the eye focus on?

Light entering the eye so that a sharp image is projected on the receptor cells

Impulses generated when the receptors are stimulated are conducted along the optic nerves to the brain, which interprets the impulses and creates the sensation of light

What is posterior 5/6 of middle (vascular) layer?

Choroid coat

What is the white part of outer (fibrous) layer?

Sclera

What is the transparent anterior portion of outer layer?

Cornea

What is the inner lining of the eyelid called?

Conjunctiva

What secretes tears?

Lacrimal gland

What fills the posterior cavity of the eye?

Vitreous humor

What is the area where the optic nerve exits the eye?

Optic disc

Whaat is the smooth muscle that controls the pupil size and light entering the eye?

Iris

What fills the anterior and posterior chambers of the anterior cavity of the eye?

Aqueous humor

What contains photoreceptor cells called rods and cones?

Retina

What connects the lens to the ciliary body?

Suspensory ligament

What causes the lens to change shape?

Ciliary muscles

What structures and fluids through which light passes as it travels from the cornea to the retina?

Cornea → aqueous humor → pupil → lens → vitreous humor → retina

What is the structure of a rod?

Tall and cylindrical

Located in peripheral retina

What is the function of a rod?

Operates in low light conditions (night vision)

Provides monochromatic (B&W) vision

What is the structure of a cone?

Conical, concentrated in the fovea (center of retina) to provide high-acuity, sharp images

What is the function of a cone?

Requires bright lights to operate (daytime vision)

Provides color vision (3 types sensitive to different wavelengths)