Eye

Question 1

conjunctiva

Answer 1

protective layer front

Question 2

cornea

Answer 2

transparent layer front

Question 3

iris

Answer 3

controls pupil aptiture

Question 4

aqueous humour

Answer 4

between cornea and lens

Question 5

lens

Answer 5

refracts light on to retina

Question 6

ciliary muscle

Answer 6

accommodation

Question 7

sclera

Answer 7

protective layer around most

Question 8

virtuous humour

Answer 8

liquid centre

Question 9

blind spot

Answer 9

no light receptor cells

Question 10

fornea

Answer 10

high amount of cones

Question 11

retina

Answer 11

of light sensitive cells back

Question 12

light refracted at cornea and humour to focus on retina, light sensitive cells stimulated, optic nerve sends sensory neuron impulses to brain, brain interprets image correct way up

Answer 12

process of image production

Question 13

accommodation

Answer 13

eye’s ability to focus on objects at different distances by changing shape of lens

Question 14

what happens when light is dim?

Answer 14

radial muscles contract, circular muscle relax, pupils dilate

Question 15

what happens when light is bright?

Answer 15

radial muscle relax, circular muscle contract, pupils constrict

Question 16

distant objects

Answer 16

ciliary muscles relax, ligament tight, lens thin, less strong refraction

Question 17

close objects

Answer 17

ciliary muscles contract, ligament relax, lens thick, more strong refraction

Question 18

myopia (short sightedness)

Answer 18

rays focus prior to hitting retina, eyeball too long, lens too round

Question 19

hyperopia (long sightedness)

Answer 19

rays focus after retina, eyeball too short, retina too short + thin

Question 20

concave lens

Answer 20

myopia, diverges rays to converge on retina

Question 21

convex lens

Answer 21

hyperopia, curved so rays converge on retina

Question 22

laser eye surgery

Answer 22

decrease cornea thickness so less strong refraction on distant light (myopia), change cornea curve so more efficient refraction on close light (hyperopia)