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COMMENTS AND OPINIONS
Practical Classification of Nystagmus in the Clinic—Reply
Louis F. Dell’Osso, PhD;
Richard W. Hertle, MD;
Robert B. Daroff, MD
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In reply
The messages contained in our article1 were (1) infantile nystagmus syndrome (INS) is an ocular motor instability (ie, all INS is motor) with direct causes in the smooth pursuit and, in some cases, other ocular motor subsystems, regardless of any associated sensory deficits in a patient; (2) the concept that INS includes 2 types of nystagmus (1 due to a sensory deficit and the other a motor deficit) is false; (3) the assertion that these 2 putative types of nystagmus could be differentiated by waveform (or any other combination of clinical observations) is false; and (4) the attribution of those erroneous concepts to David Cogan was owing to misinterpretation of his article.2 Although there is undoubtedly a strong association between vision loss in early infancy and the onset of INS, any causal role of vision loss . . . [Full Text of this Article]
AUTHOR INFORMATION
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"Sensory" and "Motor" Nystagmus: Erroneous and Misleading Terminology Based on Misinterpretation of David Cogan's Observations
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