Eye

Question 1

Sclera

Answer 1

Tough white layer to resist punctures

Question 2

Cornea

Answer 2

Bends image, no blood vessels, 90% of focus power

Question 3

Iris

Answer 3

Circular muscle, controls pupil size, coloured part of eye

Question 4

Ciliary Muscles

Answer 4

Controls lens shape for focusing

Question 5

Choroid

Answer 5

Blood rich, dark inky layer to darken eyeball

Question 6

Lens

Answer 6

Focuses & inverts image, 10% of focus power

Question 7

Aqueous humour

Answer 7

Clear fluid between cornea and lens, fluid is renewed every half an hour, nourishes cornea

Question 8

Vitreous humour

Answer 8

Clear pressurized fluid to maintain eyeball shape

Question 9

Retina

Answer 9

Contains photoreceptors (rods & cones)

Question 10

Fovea centralis

Answer 10

90% of cones, colour vision, central & clarity/ sharpness of vision

Question 11

Blind spot

Answer 11

Where optic nerve leaves the eye, no room for photoreceptors

Question 12

Optic nerve

Answer 12

Contains 1 million axon to occipital lobe

Question 13

Rods

Answer 13

Peripheral located, black & white contrast, motion sensitive, night vision, 1 kind, pigment= Rhodopsin

Question 14

Cones

Answer 14

Centrally located, colour sensitive, clarity & detail, bright light (day), 3 kinds (RBG), Pigment=Iodopsin

Question 15

Eyebrows

Answer 15

Deflect water & debris

Question 16

Blink

Answer 16

Keeps eye moist