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Nystagmus, Pathologic

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Definition: Involuntary movements of the eye that are divided into two types, jerk and pendular. Jerk nystagmus has a slow phase in one direction followed by a corrective fast phase in the opposite direction, and is usually caused by central or peripheral vestibular dysfunction. Pendular nystagmus features oscillations that are of equal velocity in both directions and this condition is often associated with visual loss early in life. (Adams et al., Principles of Neurology, 6th ed, p272)  do not confuse with NYSTAGMUS, PHYSIOLOGIC; NYSTAGMUS, CONGENITAL is also available   
See Also Electronystagmography; Nystagmus, Physiologic
Examples Nystagmus, Congenital 		Other names Vertical Nystagmus; See-Saw Nystagmus; Rotary Nystagmus; Periodic Alternating Nystagmus; Pendular Nystagmus; Jerk Nystagmus; Horizontal Nystagmus; Convergence Nystagmus; See Saw Nystagmus; Positional Nystagmus, Non-Fatigable; Positional Nystagmus, Fatigable; Pathologic Nystagmus; Ocular Nystagmus, Spontaneous; Nystagmus, Vertical; Nystagmus, Unidirectional; Nystagmus, Temporary; Nystagmus, Symptomatic; Nystagmus, Spontaneous Ocular; Nystagmus, See-Saw; Nystagmus, Rotational
 
SubstanceCAS Registry & nameCategoriesSource
Hereditary vertical nystagmus  0   *Nystagmus, Pathologic/congenital.
Singh Chhaparwal Dhanda syndrome  0   *Cataract *Cryptorchidism *Dwarfism *Intellectual Disability *Nystagmus, Pathologic *Strabismus Patella/abnormalities.
Split hand split foot nystagmus  0   *Foot Deformities, Congenital *Hand Deformities, Congenital *Nystagmus, Pathologic.
Zonular cataract and nystagmus  0   *Cataract/congenital *Nystagmus, Pathologic.
Neuhauser Daly Magnelli syndrome  0   *Duodenal Ulcer *Nystagmus, Pathologic. Clin Genet. 1976;9(1):81-91
Episodic ataxia with nystagmus  0   *Ataxia *Nystagmus, Pathologic.

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Sources: NLM Medical Subject Headings, NIH UMLS, Drugs@FDA, FDA AERS original data copyright United States Government. No endorsement implied. Last modified 6/6/2012
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