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PART 1 > Vision > Flashcards

Vision Flashcards

1
Q

Identification of misalignment between 2 lines or gratings is called

A

Vernier acuity

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2
Q

Neonatal VA is approx

A

<6.60

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3
Q

Neural pathways to the visual cortex continue to develop to age ?

A

8

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4
Q

What is the definition of angle alpha

A

angle between optical and visual axes
describes the offset of the eye relative to the optical axis

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5
Q

How mant degrees horizontally is angle alpha

A

5.2

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6
Q

What is definiton of angle kappa

A

angle between the pupillary axis and visual axis

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7
Q

How is angle kappa measure

A

angle between centre of the pupil and the light reflex

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8
Q

How much is angle kappa horizontally

A

2.6 degrees

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9
Q

If you had to draw the visual axis what would it be

A

line to the fovea

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10
Q

If you had to draw the pupillary axis what would it be

A

line through centre of pupil

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11
Q

If you had to draw the optical axis what would it be

A

line through geometric centre of lens

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12
Q

density of cone receptors is highest where in the retina

A

fovea

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13
Q

what is the formular for snellen VA

A

1/min angle of resoluton

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14
Q

the whole letter on snellen chart subtends __ arcminutes

A

5

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15
Q

the gap in C or E on snellen chart subtends _ arcminutes

A

1

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16
Q

HOw many letters per line in logMAR

A

5

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17
Q

How many m away for logMAR chart

A

4m

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18
Q

what phenomenon is reduced in logMAR

A

crowding

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19
Q

Which 3 VA testings can be used in children

A

Teller Keeler Cardiff

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20
Q

What VA testing for 2+

A

Kay picture cared

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21
Q

Which 3 VA testing used for 3+

A

Sheridan Gardiner, Sonksn Silber, KeelerlogMAR

22
Q

What can be used for objective measure of VA

A

Visual evoked potentials

23
Q

What type of VEP used for infants/uncooperative patients

A

flash VEP

24
Q

What do Pelli Robson and Vistech wall charts measure

A

contrast sensitivity

25
Q

Fovea has poor sensitivity for which colour light

A

blue light

26
Q

How many Hz is optimum flicker

A

10Hz

27
Q

Dark adaptation takes how long

A

20 mins

28
Q

Following dark adaptation, which is more sensitiy, rods or cones

A

rods

29
Q

What phenomemen can happen in unilateral optic neuritis where there is an illusion of abnormal motion

A

Pulfirch phenomenon

30
Q

What is the total amount of light emitted called

A

luminous flux

31
Q

Luminous flux is measured in

A

lumens

32
Q

Amount of light per solid anlge is called

A

Luminous intensity

33
Q

Luminous intesnity is measure in

A

candelas

34
Q

Illumination/illuminace is described as

A

amount of light arriving at a surface

35
Q

Illumination/illuminance is meausre in

A

lux

36
Q

What is the formular for luminance

A

light emitted/light reflected from surface

37
Q

What is luminance measured in

A

lamberts

38
Q

S wave cones sensitivity to what colour and wavelength

A

blue - 445

39
Q

M wave cones sensitivity to what colour and wavelength

A

green 545

40
Q

L wave cones sensitivity to what colour and wavelength

A

red 570

41
Q

peak sensitivity for rod cones

A

500nm

42
Q

red green colour defect are from which chromosome abnormality

A

X

43
Q

in dark adapted conditions which wavelength has peak luminosity

A

blue green 500nm

44
Q

in photopic conditions which wavelength has peak luminosity

A

yellow green 555nm

45
Q

Ishihara detects what colour vision defect

A

red/green

46
Q

What is the most comprehensive colour vision test

A

Farnswork Munsell 100 hue test

47
Q

What is the colour test designed for children

A

Lanthony New Colour test

48
Q

macular disorder give rise to what colour vision defects

A

blue yello

49
Q

optic neuropathies give rise to what colour vision defects

A

red green

50
Q

Name 3 tests for steropsis

A

Frisby, Lang, TNO

PART 1 (10 decks)

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