In the Resident & Fellow Section article “Clinical Reasoning: A 36-year-old man with vertical diplopia” by S. Prasad et al. (Neurology 2009;72:e93–e99), section 3 (page e97), the abnormal muscles identified by the Parks-Bielschowsky test are given incorrectly. The correct explanation should read as follows (revisions in italics):
“According to the Parks-Bielschowsky three-step test, right hypertropia suggests weakness of the right superior oblique, right inferior rectus, left inferior oblique, or left superior rectus muscles. Next, increased right hypertropia in contralateral gaze narrows the possibilities to right superior oblique or left superior rectus weakness.” The authors regret the error.
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