The Eye

Question 1

what do the eye receptors do?

Answer 1

they are sensitive to light stimuli & send visual signals to the brain through the nervous system

Question 2

what are the components of the eye? /16

Answer 2

pupil, lens, iris, ciliary body, optic nerve, fovea, retina, choroid, sclera, cornea, eyelid, vitreous humour, aqueous humour, lateral rectus muscles, medial rectus muscles, optic disc

Question 3

describe the eyelid

Answer 3

fold of skin that covers the eye

Question 4

describe the cornea

Answer 4

transparent covering of the eye

Question 5

describe the sclera

Answer 5

white part of eye made of collagen fibres

Question 6

describe the retina

Answer 6

layer of light sensitive cells at back of the eye

Question 7

describe the choroid

Answer 7

layer of blood vessels with a black pigment

Question 8

describe the iris

Answer 8

ring of muscles around the pupil which provides eye colour

Question 9

describe the pupil

Answer 9

hole in the middle of the iris

Question 10

describe the lens

Answer 10

transparent, flexible can change shape due to ciliary muscles

Question 11

describe the vitreous humour

Answer 11

located behind the lens

Question 12

describe the ciliary body

Answer 12

attached to underside of the lens

Question 13

describe the aqueous humour

Answer 13

found behind cornea

Question 14

describe lateral rectus muscles

Answer 14

found on lateral side of the eye

Question 15

describe the medial rectus muscle

Answer 15

found on the medial side of the eye

Question 16

describe the fovea

Answer 16

spot located in the macula which has high density of cone cells

Question 17

whats the purpose of the eye lid

Answer 17

cleaning & protecting the eye

Question 18

whats the purpose of the cornea

Answer 18

protecting the eye, helps converging light rays that enter the eye

Question 19

whats the purpose of the sclera

Answer 19

provide protection & support

Question 20

whats the purpose of the retina

Answer 20

detect light rays that are focused by the cornea and the lens

Question 21

whats the purpose of the choroid

Answer 21

nourishing the eye & absorbing light

Question 22

whats the purpose of the iris

Answer 22

controls the amount of light let into the eye

Question 23

whats the purpose of the pupil

Answer 23

allowing light to enter the eye

Question 24

whats the purpose of the lens

Answer 24

focusing the light onto the retina & focusing on objects

Question 25

whats the purpose of the ciliary body

Answer 25

producing aqueous humour & helping with focusing by altering shape of the lens

Question 26

whats the purpose of the vitreous humour

Answer 26

gives the eyeball its shape

Question 27

whats the purpose of the aqueous humour

Answer 27

helps keep eye in its rounded shape & provides nutrients to the cornea & lens

Question 28

whats the purpose of the lateral rectus muscles

Answer 28

helps orientate the pupil away from the centre of the body

Question 29

whats the purpose of the medial rectus muscles

Answer 29

helps orientate the pupil towards the centre of the body

Question 30

whats the purpose of the fovea

Answer 30

giving sharp central central vision, light is focused onto this spot by the lens

Question 31

whats the purpose of the optic disc

Answer 31

where the optic nerve leaves the eye

Question 32

whats the purpose of the optic nerve

Answer 32

relaying information from retina & fovea to the brain

Question 33

describe the optic disc

Answer 33

blind spot - no photoreceptors

Question 34

describe the optic nerve

Answer 34

bundle of fibres