The Eye

Question 1

Conjunctiva

Answer 1

Transparent to let light through, and helps support the front of the eye.

Question 2

Cornea

Answer 2

Transparent surface, refraction occurs to focus light on retina. Carries out most of the refraction for focussing on distant objects.

Question 3

Pupil

Answer 3

Hole in the centre of iris which light enters the eye.

Question 4

Iris

Answer 4

Made up of circular and radial muscles, controls the amount of light entering the eye.

Question 5

Ciliary muscles

Answer 5

Contracts to change the shape of the lens and helps focus light on the retina.

Question 6

Suspensory ligaments

Answer 6

Slackens or becomes taught changing the shape of the lens

Question 7

Lens

Answer 7

Refracts light so it is focussed on the retina. Carries out most of the refraction when focussing on near objects.

Question 8

Sclera

Answer 8

Tough white protective tissue that covers the eye.

Question 9

Retina

Answer 9

Contains light sensitive receptor cells called rods - (which respond to 𝐥𝐨𝐰 𝐥𝐢𝐠𝐡𝐭 𝐢𝐧𝐭𝐞𝐧𝐬𝐢𝐭𝐲 but not wavelength → black and white) and cones - (which respond to different wavelengths but one work in 𝐡𝐢𝐠𝐡 𝐢𝐧𝐭𝐞𝐧𝐬𝐢𝐭𝐲 𝐥𝐢𝐠𝐡𝐭

Question 10

Optic nerve

Answer 10

Carries electrical impulses from receptors along sensory neurones to the brain.