Week 8- Eyes Flashcards
Light rays enter this central dark opening of the eye
pupil
the colored portion of the eye that surrounds the pupil – can appear blue, green, hazel, gray or brown and has a circular opening for the pupil
iris
a membrane lining the inner surface of the eyelids and anterior portion of the eyeball over the white of eye - it is clear and almost colorless except when blood vessels there are dilated
conjunctiva
fibrous, transparent tissue that extends like a “dome” over the pupil and
iris
cornea
what part of the eye bends or refract the rays of light so they are focused properly on the sensitive receptor cells in the posterior region of the eye
cornea
does the cornea have blood vessels?
no; it receives nourishment from nearby blood vessels
fibrous layer under the conjunctiva that extends from the cornea on the anterior surface of the eyeball to the optic nerve in the posterior of the eye
sclera
a dark brown membrane inside the sclera that contains blood vessels that supply nutrients to the eye
Choroid
adjust the shape and thickness of the lens - refraction
colliery body
refractory adjustment to focus on an object from far to near
accomidation
ciliary body also secretes a fluid called ________
aqueous humor
vitreous chamber, a large region behind the lens is filled with ___________
vitreous humor
A thin, delicate and sensitive nerve layer of the eye
retina
function in bright levels of light and responsible for color and central vision
cones
function at reduced levels of light and are responsible for peripheral vision and vision in dim light
rods
