Eye functions:

Question 1

iris

Answer 1

controls the amount of light entering the eye

Question 2

lens

Answer 2

can change the shape to focus the light onto the retina

Question 3

cornea

Answer 3

most bending of the light occurs here to help focus light onto the retina

Question 4

optic nerve

Answer 4

carries impulses away to the brain

Question 5

retina

Answer 5

black layer consisting of lots of blood vessels

Question 6

blind spot

Answer 6

point where the optic nerve attaches to the eye

no light sensitive cells here

Question 7

ciliary muscle

Answer 7

changes the thickness of the lens when focusing

Question 8

suspensory ligament

Answer 8

holds the lens in place

Question 9

aqueous humour

Answer 9

watery liquid filling in front of the eye

provides nutrients for the lens

Question 10

vitreous humour

Answer 10

transparent jelly like substance which supports the back of the eye

Question 11

pupil

Answer 11

hole in the iris through which light passes

Question 12

sclera

Answer 12

tough, white protective layer

holds shape of the eye

Question 13

choroid

Answer 13

inner sensitive layer which contrains rods cells that work in dim light and cones that detect colour and details in bright light

Question 14

fovea

Answer 14

most sensitive part of the retina due to the greatest number of cones

Question 15

conjunctiva

Answer 15

located at the front of the cornea

prevents bacteria from entering the eye