AMBV quiz

Question 1 of 1

Time Left

types of nystagmus

Match the text (click and drag)

(0/0)

Match the text
sensory defect
latent
latent latent
manifest
acquired
gaze paretic
pendular
jerk
convergence-retraction
vestibular
see saw
dissociated

Click and drag
caused by co-contraction of medial recti, jerky stimulated by attempted up gaze in which fast phase brings the 2 eyes together in a convergence movement with retraction of the globe.
one eye elevates and usually intorts as the other depresses and extorts, caused by perasellar or chiasmal lesions, may be bitemporal hemianopia
caused by cataracts, optic atrophy and aniridia . common form is albinism.
slow constant velocity drift takes the eyes off target, followed by a quick corrective saccade
caused by brain stem or cerebellar or demyelinating disease, occurs in the first few months of life
only present on occlusion
jerky, appears on eccentric gaze, beats in direction of gaze, caused by cerebellar disorders, sedative or anti convulsant meds or alcohol
present without occlusion
present on monocular occlusion, fast phase beats towards the uncovered eye, so direction of nystagmus always reverses when the cover is moved from one eye to the other, with strabismus, cyclotorsion and vertical deviation
occurs after the first months of life, caused by lesion or trauma affecting motor pathways such as multiple sclerosis or closed head trauma
caused by cerebellar or brain stem disease, down beat is suggestive of arnold-chiari malformation where veritcal pursuit and vestibulo-ocular reflex is abnormal
eye movements are dissimilar in direction, amplitude or speed, occurs in internuclear ophthalmoplegia