22 JULY 2019

Question 1

what happens when you have a CN VI dx

Answer 1

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

Question 2

right internuclear opthlanoplagie

Answer 2

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

Question 3

what happens when you have a CN III:

Answer 3

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

Question 4

what happens when you have a CN IV:

Answer 4

one eye wanders when you try to look down and across

Question 5

palsy def (in this setting)

Answer 5

damage misfunction

Question 6

misalignment acute phase is

Answer 6

diplopia

Question 7

misalignment chronic phase

Answer 7

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

Question 8

optokinetic reflex:

Answer 8

stay focused on object of interest during slow head movements

Question 9

optokinetic nystagmus:

Answer 9

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

Question 10

direction of gaze:

Answer 10

keeps objects in focus when they are moving

Question 11

VOR involves what structures

Answer 11

inner ear: which detects movements of the head

and the semicircular canals

Question 12

how do you test VOR:

Answer 12

make fast head movements

Question 13

a real world example of VOR is

Answer 13

a movie steady cam - the steady cam is the VOR

Question 14

VOR suppression:

Answer 14

when you purposefully stop the natural reflex of VOR

Question 15

gaze stabilization:

Answer 15

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

Question 16

real world example of DSFX of gaze stabilization

Answer 16

the cops camera

Question 17

smooth pursuits is

Answer 17

conscious optokinetic movemets where you are tracking a moving object

Question 18

nystagmus description of movement:

Answer 18

slow then fast jerk

Question 19

abnormal vs. normal nystagmus:

Answer 19

normal : VOR when head is moving

abnormal: when head is not moving

Question 20

saccades:

Answer 20

eyes move between stationary objects

Question 21

nystagmus def:

Answer 21

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

Question 22

physiologic nystagmus =

Answer 22

normal nystagmus = happens when you move your head

Question 23

pathologic nystagmus =

Answer 23

abnormal nystagmus = happens when you are not moving

Question 24

voluntary saccades happens when

Answer 24

we read a book or do we look between stationary objects

Question 25

reflexic saccades happens when

Answer 25

superior colliculi kicks in the and you turn your head to an object moving

Question 26

VOR piece of nystagmus is

Answer 26

slow - eyes lag behind

Question 27

the saccade of nystagmus piece is

Answer 27

fast - eyes catch up

Question 28

there are two pieces of nystagmus:

Answer 28

VOR piece - slow : eyes lag behind | saccades - fast: eyes catch up

Question 29

two types of saccades

Answer 29

voluntary | reflexic

Question 30

list the disorder of eye movements:

Answer 30

1. CN 2. MLF 3. NMJ 4. extrocular Mm 5. vestibular 6. cerebellum

Question 31

motion sickness

Answer 31

due to conflicting between systems: 1. we are not moving 2. we are moving

Question 32

why does sitting in the front help with car sickness:

Answer 32

eyes are better to detect motion