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BS0012 > Vision > Flashcards

Vision Flashcards

1
Q

Structure of sclera

A

White part the eye
Collagen and elastin fibres

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2
Q

Function of sclera

A

Provide attachment for muscles

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3
Q

Structure of cornea

A

Clear part of sclera

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4
Q

Function of cornea

A

Acts as fixed lens that allows light into eye

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5
Q

Structure of the iris

A

Coloured part of the eye

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6
Q

Function of iris

A

Control opening of pupil

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7
Q

Structure of lens

A

Transparent fibres in clear membrane

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8
Q

Function of lens

A

Fine focusing

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9
Q

Two humors

A

Aqueous humor
Vitreous humor

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10
Q

Structure of aqueous humor and vitreous humor

A

Gel liquid filling eye

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11
Q

Function of aqueous and vitreous humor

A

Maintain shape of eye
Provides nutrients to cornea + eye lens

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12
Q

Structure of retina

A

Internal membrane with photoreceptors

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13
Q

What 2 photo receptors does the retina contain

A

Rods
Cones

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14
Q

Function of retina

A

Convert light to electrical signal

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15
Q

Why is the optic nerve described as a blind spot

A

No photoreceptors

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16
Q

Function of optic nerve

A

Transmit electrical impulse from retina to brain

17
Q

Why is the shape of the lens important

A

Curved shape allows fine focus

18
Q

What is accommodation

A

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

19
Q

What presbyopia

A

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

20
Q

Choroid

A

Provide oxygen + nutrients to outer retina

21
Q
A

Sclera

22
Q
A

Choroid

23
Q
A

Retina pigment epithelium

24
Q

What is the retinal pigment epithelium

A

Pigment layer for light absorption

25
Q
A

Photoreceptors
Rods + cones

26
Q

Where are rods found

A

Retina

27
Q

Where are codes found

A

Fovea

28
Q

Name of light sensitive pigment in rods

A

Rhodopsin

29
Q

Name of light sensitive pigment found in cones

A

Iodopsin

30
Q

Acuity of cones

A

High visual acuity

31
Q

Acuity of roles

A

Low visual Acuity

32
Q

Resolution power of rods

A

Poorly resolved images

33
Q

Resolution power of cones

A

Well resolved image

34
Q

Which one is sensitive to colour

A

Cones
Red Green Blue

35
Q

What type of light are rods sensitive to

A

Dim light

36
Q

Why are rods described as monochromatic

A

Not sensitive to colour

37
Q

Phototransduction

A

Conversion of light into electrical signals

38
Q

Steps of phototransduction

A

Light changes rhodopsin structure
Change permeability to sodium

39
Q

Why are 2 eyes better than 1

A

To make 3D model of world

BS0012 (12 decks)

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