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What is oscillopsia?
sensation of movement
Nystagmus is named for the _____phase. The pathologic phase is the _____phase
What are 2 key characteristic of Congential Nystagmus?
- reversal of the OKN
- velocity of the slow-phase increases exponetially
Describe Congential Nystagmus
- associated with normal or abnl vision
- no oscillopsia
- + null point
- better with convergences/worse with distance
- resolves in sleep
Latent nystagmus-which eye is the fast phase toward
Fast phase toward the uncovered eye
Monocular nystagmus of childhood is associated with what brain lesion?
Spasmus nutans. ID the following
- head tilt
- head nodding
- no lesion- it is benign and resolves within first decade.Rule out Monocular nystagmus of Childhood
What is gaze evoked nystagmus? Fast phase?
Location of dz? Horizontal
- Inability to maintain fixed ecentric gaze
- direction of gaze
- neural integrator
- -Horizontal- nucleus prepsoitus hypoglossi
- -Vertical- Interstital nucleus of Cajal
Vestibular nystagmus associated with
- hearing loss
- vertical torsion
- dampens with fixation
Causes of vestibular nystagmus
- Viral Vestibular neruontitis
Down Beat Nystagmus worse in which gaze
down and to the side
Cause of Downbeating nystagmus?
- Cervical Medullary jnx
- Arnold Chiari
- Lithium codeine
Upbeating nystagmus lesion location?
See-Saw associated with what type of tumor?
Periodic Alternating Nystagmus lesion location?
Ocular bobbing lesion location?
Flutter/opsoclonus lesion location?
- Neuroblastoma -child
- brainstem encephalitis
Oculopalatal myoclonus lesion location?
inferior olivary nucleus
Oculomasticatory Myorhythmia associated with
Whipple dz, vertical saccadic palsy, nystagmus with masticatory muscles
Cerebral lesion looks which way
Brainstem lesions looks which way
- toward the lesion
- away from the side of the lesion
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