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8 Cards in this Set
- Front
- Back
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Searching/Sensory nystagmus
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DDx: albinism, achromatopsia, lebers congenital amaurosis, ON hypoplasia, aniridia, media opacities (cataracts)
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Latent nystagmus
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increases w/ monocular occlusion of abducted fixing eye (null point in adduction) (minimized by adducting eye); assoc w/ disruption of early binocular visual development (cong ET, cong monocular cataract); pts may adapt w/ face turn to adduct eye; Tx=reduce ET & improve binocular fusion (ie. give full hyperopic MRx); note pupillary constriction in natural adducted stated (indicating accommodative effort); slow phase decreases in velocity (Slow towards nose, fast towards ear)
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Congenital motor nystagmus
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conjugate, jerk in perinatal period; assoc w/ null point & head turn; VA 20/20-20/70 (NVA>DVA); ceases when asleep; slow phase increases in velocity
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Pendular nystagmus
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Sensory nystagmus
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Jerk nystagmus
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motor nystagmus
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Spasmus nutans
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Triad=monocular or dissociated small amplitude nystagmus, head bobbing, torticollis; diagnosis of exlusion, therefore: DDx (MUST exclude)=chiasmatic gliomas, subacute necrotizing encephalomyopathy (indications: optic atrophy, irritability, vomiting, increased ICP); typically resolves w/in 2 years
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Down beat nystagmus
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Arnold Chiari malformation, increased ICP, lithium (therapeutic & toxic)—may not resolve after cessation of drug; paraneoplastic cerebellar degeneration (esp. gyn malignancy& SmCCa of lung); craniocervical junction abnormalities (tumor, syrinx, chiari malformation)
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Contraction-retraction nystagmus
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parinauds syndrome
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