Structure of the eye

Question 1

Cornea

Answer 1

Refracts the light and protects the eye

Question 2

Iris

Answer 2

Controls how much light enters the eye through the pupil

Question 3

Lens

Answer 3

Focuses light on the retina

Question 4

Optic Nerve

Answer 4

A bundle of sensory neurones that carry electrical impulses to the brain

Question 5

Retina

Answer 5

Layer of tissue at the back of the eye that contains photoreceptor cells called rods and cones

Question 6

Fovea

Answer 6

Area of the retina with highest concentration of cone cells that provide sharp vision

Question 7

Aqueos Humor

Answer 7

Watery substance that maintains pressure in the eye

Question 8

Vitreous Humour

Answer 8

Jelly - like substance that shape the eye and attaches the retina

Question 9

Ciliary Muscle

Answer 9

Helps change the shape of the lens in the process accommodation

Question 10

Sclera

Answer 10

Tough outer layer (the white part of the eye)

Question 11

Suspensory Ligaments

Answer 11

Attach the lens to the ciliary muscles

Question 12

Pupil

Answer 12

Hole in the centre of the eye that lets light in

Question 13

Choroid

Answer 13

Layer containing blood vessels to deliver nutrients

e.g. oxygen, to the eye

Question 14

Blind Spot

Answer 14

The optic disc is where the eye is connected to the optic nerve. There are no photoreceptors here.

Question 15

Rods

Answer 15

Photoreceptors that work well in dim light but can only see black and white

Question 16

Cones

Answer 16

Photoreceptors that work well in bright light

Three types: red, green, blue