Vision

Question 1

simplest eye

Answer 1

detect light intensity and direction its coming from

ocellus in planaria

Question 2

ocellus

Answer 2

oriented in different directions. it receives light in and orients itself until the action potentials are the same and then it backs itself out of the light

Question 3

compound eye

Answer 3

anthropods (insects/ crustaceans)
contains several 1000 ommatida.
each detect light and good at detecting movement
rate of 330/s (human 50/s)

Question 4

single lens eye

Answer 4

mulluscs, jellies, spiders

moves forward adn back like a camera to focus light on the retina

Question 5

vertebrate eye

Answer 5

cornea
aqueous humor
pupil
lens
viterous humor
retina

Question 6

cornea

Answer 6

acts as an initial fixed lens

Question 7

pupil

Answer 7

hole in center that allows light in

diameter determined by iris

Question 8

lens

Answer 8

focuses the light onto the back of the eye

Question 9

retina

Answer 9

made up of cells involved in photo transduction
ganglion cell layer
interneuron layer
photoreceptors

Question 10

accomodations

Answer 10

lens changes shape to keep images in focus

Question 11

hyperopia

Answer 11

far sighted

focal point falls behind retina

Question 12

myopia

Answer 12

near sighted

focal point falls in front of retina

Question 13

presbyopia

Answer 13

loss of lens accommodation ( with aging)

Question 14

astigmatism

Answer 14

imperfectly shaped cornea

generates 2 focal points ( light scatters)

Question 15

nocturnal animals

Answer 15

tapetum (reflective layer)

Question 16

birds

Answer 16

vascular retina, more cones, multiple fovea

Question 17

squid/octopus

Answer 17

retina in proper orientation

Question 18

phototransduction

Answer 18

when light strikes photoreceptor, it releases less neurotransmitter

Question 19

iris

Answer 19

changes diameter or pupil

Question 20

aqueous humor

Answer 20

fluid inbetween cornea and pupil

Question 21

viterous humor

Answer 21

fluid in the eye

Question 22

fovea

Answer 22

depression in the retina where visual acuity is highest

Question 23

rods

Answer 23

high sensitivity to light
slow response
one type of rod pigment

Question 24

cones

Answer 24

low sensitivity to light
3 cones for color
fast response