22 JULY 2019 Flashcards
what happens when you have a CN VI dx
the eye with broken CN VI will stay straight when trying to look to the side
right internuclear opthlanoplagie
when CN is working but the MLF is broken so can’t move in conjugate fashion
what happens when you have a CN III:
one eye will be ABducted to the side because CN III isn’t working so doesn’t pull it to the front
what happens when you have a CN IV:
one eye wanders when you try to look down and across
palsy def (in this setting)
damage misfunction
misalignment acute phase is
diplopia
misalignment chronic phase
resolves dipoplia = suppressed vision from 1 eye = loss depth perception
optokinetic reflex:
stay focused on object of interest during slow head movements
optokinetic nystagmus:
when you have oscillations of the eye can be normal or abnormal
direction of gaze:
keeps objects in focus when they are moving
VOR involves what structures
inner ear: which detects movements of the head
and the semicircular canals
how do you test VOR:
make fast head movements
a real world example of VOR is
a movie steady cam - the steady cam is the VOR
VOR suppression:
when you purposefully stop the natural reflex of VOR
gaze stabilization:
movements that keep visual objects stable as we move through it
- keeps the world steady as I move through it
