Vision Quiz

Question 1

outermost; avascular layer of eye

Answer 1

fibrous layer

Question 2

tough outer layer = white of the eye (reflects light) connective tissue that serves as a protective layer for the eye

Answer 2

sclera

Question 3

anterior portion; transparent and function is to let light waves into the eye; allows light to enter the eye

Answer 3

cornea

Question 4

middle layer of the eye and contains blood vessels

Answer 4

vascular layer

Question 5

helps to nourish the inner layer of the eye through diffusion; beneath the eye

Answer 5

choroid

Question 6

produces aqueous humor which needs to constantly be replaced containing the ciliary muscle

Answer 6

ciliary body

Question 7

connected to the lens via the suspensory ligaments ; function is to change the shape of lens (used to focus the light on the retina)

Answer 7

ciliary muscle

Question 8

a pigmented, donut of muscle giving color to the eye

Answer 8

iris

Question 9

the hole of the iris

Answer 9

pupil

Question 10

makes the pupil smaller

Answer 10

constrictor pupillae

Question 11

makes the pupil larger

Answer 11

dilator pupillae

Question 12

next to the choroid; contains melanin and functions to absorb light to prevent it from reflecting across the retina and blurring vision

Answer 12

retinal pigmented epithelium

Question 13

comprised of three layers - inner layer of ganglion cells, middle layer of bipolar, amacrine, and horizontal cells, and outer layer of photoreceptors

Answer 13

neural layer

Question 14

two types of photoreceptors

Answer 14

rods and cones

Question 15

provide us with color vision in relatively bright light; sunlight during the day

Answer 15

cones

Question 16

provide the ability to see in black and white during relatively low light conditions; moon at night

Answer 16

rods

Question 17

indentation of the retina (only cones & has best visual acuity)

Answer 17

fovea

Question 18

blind spot of retina (no photoreceptors)

Answer 18

optic disk

Question 19

behind the lens; contains the vitreous humor

Answer 19

posterior cavity

Question 20

a firm gelatinous mass which maintains the spherical structure of the eye

Answer 20

vitreous humor

Question 21

in front of the lens; filled with aqueous humor

Answer 21

anterior cavity

Question 22

from the cornea to the iris

Answer 22

anterior chamber

Question 23

from the iris to the lens

Answer 23

posterior chamber

Question 24

a form of energy existing as electromagnetic waves; can be reflected and refracted

Answer 24

light

Question 25

they can be convex (cause light to converge at focal point) or concave (cause light to diverge)

Answer 25

lenses

Question 26

the ability of the lens to change its shape in order to change the angle of refraction of a light ray in order to see something close up

Answer 26

accommodation

Question 27

either the lens or the cornea is too bulged (strong) for the length of the eye so light rays bend too much

Answer 27

myopia (near-sightedness)

Question 28

either the lens or the cornea is too weak for the length of the eye

Answer 28

hyperopia (far-sightedness)

Question 29

irregularly shaped lens or cornea causing erratic refraction

Answer 29

astigmatism

Question 30

hardening of the lens with age

Answer 30

presbyopia

Question 31

the lens or cornea becomes opaque

Answer 31

cataract

Question 32

increased bulge of the cornea due to the increase of aqueous humor

Answer 32

glaucoma

Question 33

the conversion of light energy into electrical energy

Answer 33

phototransduction

Question 34

formed from retinal and opsin

Answer 34

rhodopsin

Question 35

when in dim light and looking in stacked disks in rods...

Answer 35

cGMP levels are high in the cell

Question 36

when cGMP levels are high in the cell...

Answer 36

Na+ channels open