eyeball anatomy

Question 1

what is hyperopia?

Answer 1

a vision condition where the eyeball grows too short. nearby objects are blurry while far away objects are clear. (farsighted)

Question 2

what is myopia?

Answer 2

a vision condition when your eyeball grows too long. faraway objects are blurry while close objects are clear. (nearsighted)

Question 3

what is astigmatism?

Answer 3

when the lens or cornea are shaped differently from each other. cause blurred vision.

Question 4

emmetropia

Answer 4

20/20 vison

Question 5

D (quizlet picture)

Answer 5

cornea.. transparent part of the eye that cover the iris and the pupil and allows light to enter

Question 6

E

Answer 6

iris.. the colored tissue in the front of the eye that helps control the amount of light entering the eye

Question 7

F

Answer 7

pupil.. the round opening in the center of the iris

Question 8

G

Answer 8

aqueous humor.. clear fluid filling between the lens and cornea

Question 9

H

Answer 9

lens.. a clear, curved structure at the front of the eye behind the pupil that focuses the light rays entering the eye making an image on the retina

Question 10

J

Answer 10

vitreous humor..transparent tissue filling the eyeball behind the lens

Question 11

K

Answer 11

sclera.. the white outer layer of the eyeball

Question 12

M

Answer 12

retina.. the light sensitive layers of nerve tissue at the back of the eye that receive images and signals and send them through the optic nerve to the brain

Question 13

P

Answer 13

optic nerve.. the nerve that carries messages from the retina to the brain

Question 14

Q

Answer 14

optic disc.. where ganglion cell axons exit the eye to from the optic nerve

Question 15

rods

Answer 15

retinal receptors that detect black, white, and gray

Question 16

cones

Answer 16

receptors in the macula that detect color

Question 17

L

Answer 17

choroid.. the thin layer between the sclera and the retina. it is filled with blood vessels that bring oxygen and nutrients to the eye

Question 18

what is the tapetum?

Answer 18

under the sclera and apart of the choroid.. provide the light-sensitive retinal cells with a second opportunity for photon-photoreceptor stimulation, thereby enhancing visual sensitivity at low light levels