moves eye up
moves eye down
moves eye toward midline
moves eye away from midline
located above the eyeball and rotates the eyeball
located below the eyeball and rotates the eyeball
conversion of light energy into a visual perception
mucous membrane on surface of eyeball for protection
white outer layer of the eye (excluding cornea) used for muscle attachment, it has many collagenous and elastic fibers
anterior portion of eye that transmits light entering the eye
middle layer of eye that contains pigments and vessels, absorbs excess light and is the attachment of internal structures of the eye.
fluid that is secreted by the ciliary process, nourishes and maintains the shape of the eyeball.
canal of schlemm
aka scleral venous sinus, at the junction of the sclera and cornea in the medial corner of the eye, it drains aqueous humor
where the aqueous humor goes after leaving the canal of schlemm
anterior cavity of the eye
space anterior to the lens that contains aqueous humor and has two chambers.
anterior chamber of the anterior cavity
space between the cornea and iris
space between the iris and the lens
posterior chamber of the anterior cavity
hole formed by the iris that blocks divergent rays and excess light
focuses light on the retina, it is biconvex and avascular
connects the lens to the ciliary body
the circular attachment for suspensory ligaments, has two parts: ciliary process and ciliary muscle
located on the anterior portion of the ciliary body it alters the shape of the lens
contains vitreous humor and maintains the shape and supports the internal structures such as the retina.
neural layer that contains photoreceptors and converts light energy to nerve impulses
aka blind spot, area in the retina where the optic nerve exits the back of the eye
exact center of the posterior portion of the retina, contains the central fovea
area that contains the highest concentration of cones
the bending of light, the lens fine tunes
75% of all refraction occurs here
constriction (of pupil)
the blocking of divergent rays so image is projected clearly on the retina
accommodation (of lens)
increased curvature of the lens for near vision
lens shortens (rounds)
happens to the lens when ciliary muscles contract for near objects
lens lengthens (flattens)
happens to lens when ciliary muscles relax for distant objects
medial movement of the two eyeballs so both are directed toward an object, light rays strike the corresponding points on each retina, binocular vision
image on retina is upside down
normal eye, normal vision, light is focused directly on the retina
nearsightedness, light focused in front of the retina, distant objects are blurred, corrected my concave lenses
farsightedness, light is focused behind the retina, near objects are blurred, corrected by convex lens
nearsightedness, by a concave lens in a pair of glasses.
abnormally long eyeball would cause what? how would this be corrected?
farsightedness, by a convex lens in a pair of glasses
abnormally short eyeball would cause what? how would this be corrected?