Eye

Question 1

Sclera

Answer 1

The tough supporting wall

Question 2

Cornea

Answer 2

Transparent outer layer at the front - refracts light to the lens

Question 3

Iris

Answer 3

The muscles that control the diameter of the pupil

Go across into the pupil

Question 4

Lens

Answer 4

Behind the pupile, focuses light onto the retina

Question 5

Retina

Answer 5

Back of the eye, receptor cells for light intensity and colour

Question 6

Ciliary musclée and suspensory ligaments

Answer 6

Control lens shape, muscles are circular with ligaments pointing inwards inside

Question 7

Optic nerve

Answer 7

Carried impulses from the retina to the brain

Question 8

Near objects

Answer 8

Ciliary muscles contract, which slackens suspensory ligaments
Lens becomes more curved
Refracts light more

Question 9

Distant objects

Answer 9

Ciliary muscles relax, allows the suspensory ligaments to pull tight
Lens goes thinner
Refracts light less

Question 10

Hyperopia

Answer 10

The lens doesn’t refract the light enough
Brought into focus behind the retina
Use glasses with a convex lens

Question 11

Myopia

Answer 11

Lens refracts light too much or the eyeball is too long
Brought into focus in front of the retina
Use concave glasses

Question 12

Bright lights

Answer 12

Radial muscles relax
Circular muscles contract
Less light can enter the eye

Question 13

Dim lights

Answer 13

Radial muscles contract
Circular muscles relax
More light can enter the eye