anatomy and physiology of the eye

what is the outermost layer of the eye which is white and composed of tough connective tissue?

sclera

what is the transparent part of the outermost layer of the eye that protects the lens and permits light to enter the eye?

cornea

what is the second layer of the eye that is black and absorbs light so that it does not reflect in the eye and impair vision?

choroid

what is the innermost layer of the eye?

retina

what is gray in color and contains the light sensitive cells known as the rods and cones?

retina

what consists of smooth muscles that hold the viconvex, transparent, and flexible lens in place?

ciliary body

what is the colored part of the eye?

iris

the anterior compartment of the eye is filled with what fluid

aqueous humor

what substance is produced by the ciliary body that maintains ocular pressure and helps to bend light?

aqueous humor

what substance is in the posterior compartment of the ey and helps maintain ocular pressure, refracts light and holds the retina and lens in place?

vitreous humor

what is the yellowish spot in the center of the retina called?

macula lutea

what region produces the sharpest vision when we look directly at an object?

fovea centralis

where do nerve fibers leave the eye as the optic nerve?

optic disk

why is the optic disk called the blind spot?

it has no receptor cells

what pigment do rod cells contain?

rhodopsin

when exposed to light what does rhodopsin breaks down into what?

opsin and retinal

manufacture of retinal requires what vitamin?

vitamin A