Vision

Question 1

Structure of sclera

Answer 1

White part the eye
Collagen and elastin fibres

Question 2

Function of sclera

Answer 2

Provide attachment for muscles

Question 3

Structure of cornea

Answer 3

Clear part of sclera

Question 4

Function of cornea

Answer 4

Acts as fixed lens that allows light into eye

Question 5

Structure of the iris

Answer 5

Coloured part of the eye

Question 6

Function of iris

Answer 6

Control opening of pupil

Question 7

Structure of lens

Answer 7

Transparent fibres in clear membrane

Question 8

Function of lens

Answer 8

Fine focusing

Question 9

Two humors

Answer 9

Aqueous humor
Vitreous humor

Question 10

Structure of aqueous humor and vitreous humor

Answer 10

Gel liquid filling eye

Question 11

Function of aqueous and vitreous humor

Answer 11

Maintain shape of eye
Provides nutrients to cornea + eye lens

Question 12

Structure of retina

Answer 12

Internal membrane with photoreceptors

Question 13

What 2 photo receptors does the retina contain

Answer 13

Rods
Cones

Question 14

Function of retina

Answer 14

Convert light to electrical signal

Question 15

Why is the optic nerve described as a blind spot

Answer 15

No photoreceptors

Question 16

Function of optic nerve

Answer 16

Transmit electrical impulse from retina to brain

Question 17

Why is the shape of the lens important

Answer 17

Curved shape allows fine focus

Question 18

What is accommodation

Answer 18

The process where an eye changes optical power to focus on an object depending on distance

Question 19

What presbyopia

Answer 19

When the lens hardens with age
Can’t accommodate near focus
Push things far

Question 20

Choroid

Answer 20

Provide oxygen + nutrients to outer retina

Question 21

Answer 21

Sclera

Question 22

Answer 22

Choroid

Question 23

Answer 23

Retina pigment epithelium

Question 24

What is the retinal pigment epithelium

Answer 24

Pigment layer for light absorption

Question 25

Answer 25

Photoreceptors Rods + cones

Question 26

Where are rods found

Answer 26

Retina

Question 27

Where are codes found

Answer 27

Fovea

Question 28

Name of light sensitive pigment in rods

Answer 28

Rhodopsin

Question 29

Name of light sensitive pigment found in cones

Answer 29

Iodopsin

Question 30

Acuity of cones

Answer 30

High visual acuity

Question 31

Acuity of roles

Answer 31

Low visual Acuity

Question 32

Resolution power of rods

Answer 32

Poorly resolved images

Question 33

Resolution power of cones

Answer 33

Well resolved image

Question 34

Which one is sensitive to colour

Answer 34

Cones Red Green Blue

Question 35

What type of light are rods sensitive to

Answer 35

Dim light

Question 36

Why are rods described as monochromatic

Answer 36

Not sensitive to colour

Question 37

Phototransduction

Answer 37

Conversion of light into electrical signals

Question 38

Steps of phototransduction

Answer 38

Light changes rhodopsin structure Change permeability to sodium

Question 39

Why are 2 eyes better than 1

Answer 39

To make 3D model of world