22 JULY 2019 Flashcards

1
Q

what happens when you have a CN VI dx

A

the eye with broken CN VI will stay straight when trying to look to the side

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2
Q

right internuclear opthlanoplagie

A

when CN is working but the MLF is broken so can’t move in conjugate fashion

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3
Q

what happens when you have a CN III:

A

one eye will be ABducted to the side because CN III isn’t working so doesn’t pull it to the front

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4
Q

what happens when you have a CN IV:

A

one eye wanders when you try to look down and across

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5
Q

palsy def (in this setting)

A

damage misfunction

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6
Q

misalignment acute phase is

A

diplopia

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7
Q

misalignment chronic phase

A

resolves dipoplia = suppressed vision from 1 eye = loss depth perception

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8
Q

optokinetic reflex:

A

stay focused on object of interest during slow head movements

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9
Q

optokinetic nystagmus:

A

when you have oscillations of the eye can be normal or abnormal

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10
Q

direction of gaze:

A

keeps objects in focus when they are moving

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11
Q

VOR involves what structures

A

inner ear: which detects movements of the head

and the semicircular canals

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12
Q

how do you test VOR:

A

make fast head movements

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13
Q

a real world example of VOR is

A

a movie steady cam - the steady cam is the VOR

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14
Q

VOR suppression:

A

when you purposefully stop the natural reflex of VOR

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15
Q

gaze stabilization:

A

movements that keep visual objects stable as we move through it
- keeps the world steady as I move through it

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16
Q

real world example of DSFX of gaze stabilization

A

the cops camera

17
Q

smooth pursuits is

A

conscious optokinetic movemets where you are tracking a moving object

18
Q

nystagmus description of movement:

A

slow then fast jerk

19
Q

abnormal vs. normal nystagmus:

A

normal : VOR when head is moving

abnormal: when head is not moving

20
Q

saccades:

A

eyes move between stationary objects

21
Q

nystagmus def:

A

involuntary back adn forth movements of the eyes designed to keep visual field : world steady when we’re moving

22
Q

physiologic nystagmus =

A

normal nystagmus = happens when you move your head

23
Q

pathologic nystagmus =

A

abnormal nystagmus = happens when you are not moving

24
Q

voluntary saccades happens when

A

we read a book or do we look between stationary objects

25
reflexic saccades happens when
superior colliculi kicks in the and you turn your head to an object moving
26
VOR piece of nystagmus is
slow - eyes lag behind
27
the saccade of nystagmus piece is
fast - eyes catch up
28
there are two pieces of nystagmus:
VOR piece - slow : eyes lag behind | saccades - fast: eyes catch up
29
two types of saccades
voluntary | reflexic
30
list the disorder of eye movements:
1. CN 2. MLF 3. NMJ 4. extrocular Mm 5. vestibular 6. cerebellum
31
motion sickness
due to conflicting between systems: 1. we are not moving 2. we are moving
32
why does sitting in the front help with car sickness:
eyes are better to detect motion