Parts of the eye 2

Question 1

iris

Answer 1

controls the amount and intensity of light entering the eye

Question 2

cornea

Answer 2

a curved surface that focuses most of the light

Question 3

lens

Answer 3

can be altered to carry out fine focusing

Question 4

suspensory ligaments

Answer 4

keeps the lens elliptical by tension when looking at distant objects

Question 5

ciliary muscles

Answer 5

circular, take tension out of the ligaments when looking at near objects
Changes thickness of lens when focusing

Question 6

cones

Answer 6

used for detailed colour vision
Three types: blue, green and red absorbing
Low sensitivity to light

Question 7

rods

Answer 7

black and white vision

high sensitivity to light

Question 8

blind spot

Answer 8

point where the optic nerve attaches to the eye

Question 9

retina (fovea)

Answer 9

image falls on this

contains cones

Question 10

optic nerve

Answer 10

carries nerve impulses away from the eye to the brain

Question 11

vitreous humour

Answer 11

jelly-like

maintains the internal pressure and shape of the eye

Question 12

aqueous humour

Answer 12

watery liquid filling the front of the eye

Question 13

sclerotic

Answer 13

tough, white protective layer