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49 Cards in this Set

  • Front
  • Back
isolate oblique by
ADDucting 51-55
isolate recti by
ABDucting 23
describe a CN 4 palsy.
SO adducts the eye and depresses it thus when there is a palsy the eye is up and out
Anisocoria is due soley to
efferent issue thus CN 3 at fault
fixed dilated pupil due to aneurysm affectd
CN 3
If pupil constricts w/ 1% pilocarpine the pt has what?
3rd nerve palsy
If pupil doesnt constrict w/ 1% pilocarpine the pts dilated pupil is due to what?
trauma or drug induced
An Adie's pupil is what?
A= Acutely
D= Dilated
Who gets Adie's?
Young females (20-40)
Adie's affects one or both eyes?
80% unilateral then can become bilateral
Adie's pupils will respond how to light and near stimuli?
slow
Argyll Robertson Pupil

what?
lesion?
response?
cause?
ARP = Acc Response Present but no light response

pupil is bilaterally miotic due to tectotegmental lesion

prostitutes are SAD; caused by Syphilis, Alcohol, Diabetes
Prostitutes are sad
ARP caused by syphilis, alcohol, diabetes
Why is the acc response present in ARP?
because acc response comes from frontal eye fields and goes into EW nucleus which are intact in ARP
Horner's pupil is caused by what lesion?
sympathetic preganglionic or postganglionic lesion usually pancost tumor of lung apex
Triad of Horners
Ipsilateral miosis, anhydrosis, ptosis
Horners is most evident when?
in dark light because pupil doesnt dilate
Cocaine does what to a normal eye
dilate by blocking NE reuptake
Cocaine will do what to a Horner's pupil?
does not dilate it thus tells you there is a sympathetic lesion but not if it is pre or post ganglionic
Hydroxyamphetamine does what to normal eye
dilates by releasing NE from POSTGANGLIONIC neurons
If 1% hydroxyamphetamine dilates a Horner's pupil, what can be said about the lesion?
lesion is preganglionic bc the reason eye was dilated was because the postganglionic neurons are working thus releasing NE causing dilation
If 1% hydroxyamphetamine does not dilate a Horner's pupil, what can be said about the lesion?
lesion is postganglionic because this works by releasing NE postganglionic thus if there was no dilation, NE wasnt released bc of faulty postganglionic neurons
Y axis runs anterior to posterior and is known as
visual axis
what did Fick hypothesize?
eye rotated around one point located where the axes instesect
is fick's model valid?
no because there is no single center of rotation since the eye moves as it rotates
donder's law
orientation of eye for specific gaze is always the same regardless of how eye moves to get in that gaze position
listing's law
in order to get into specific gaze eye has to rotate around listing's plane
how many microsaccades do we do per minute?
2-5
saccades
long latency, takes long to get started but are very fast once they do
saccades begin where and project where

Afferent branch
begin at superior colliculus and frontal eye fields

project to PPRF and MLF
what coordinates all eye movements?
MLF this is where PPRF and CN 3,4,6 communicate at
are pursuits voluntary or involuntary?
voluntary
pursuits have
short latency but slow eye movement
pursuit problems detected via
OKN drum
how are vergence movements different than all other eye movements?
disconjugate, eyes move in different directions
vergence velocity
10 deg/sec
fusional vergence is initiated by
disparity
Purpose of VOR
stabilize retinal image during brief head movemnt by producing eye movement opp to head movement thus keeping image centered
VOR works best for ___ head movements
fast
input to horizontal canal on one side results in eye movement toward what side
opposite side

left horiz canal --> right eye rotation
cold water in right ear causes
CO

fast movement to left
warm water in right ear causes
WS

fasr movement to right
OKN fxn
takes over when VOR fades allowuing image stabilization
OKN used in babies for
gross VA
OKN in babies
T--> N
saccades summary
puts objects on fovea
l = 200ms
v = 1000 deg/sec
pursuit summary
puts image of moving objects on fovea
l = 125 ms
v = 50 deg/sec
VOR summary
stable image during brief head rotations

l = 15ms
v = 300 deg/sec
vergence summary
moves eye in opp directions to keep single object on fovea

l=160ms
v=10 deg/sec