A2 1 Eye Definitions

Question 1

Conjunctiva

Answer 1

Protects cornea from damage - thin transparent membrane

Question 2

Sclera

Answer 2

Site of attachment of eye muscles, protects against damage

Question 3

Cornea

Answer 3

Most refraction takes place here

Question 4

Aqueous humourous

Answer 4

Maintains shape of the front of the eye

Question 5

Iris

Answer 5

Adjusts the size of the pupil to control the amount of light entering the eye

Question 6

Pupil

Answer 6

Area where light reaches the lens

Question 7

Ciliary body

Answer 7

Adjusts shape of lens to focus on rays

Question 8

Suspensary ligaments

Answer 8

Transfer tension in wall of eyeball to make lens thinner

Question 9

Vitreous Humour

Answer 9

Maintains shape of rear part of eye and supports the lens

Question 10

Retina

Answer 10

Rods and cones initiate impulses in associated neurones when stimulated

Question 11

Fovea

Answer 11

Part of the eye that provides clearest colour vision

Question 12

Choroid

Answer 12

Prevents refraction of light back through the eye

Question 13

Optic nerve

Answer 13

Transmits impulses from retina to the brain

Question 14

Blind spot

Answer 14

Contains no light sensitive cells so is not sensitive to light