Journal
JOURNAL OF AAPOS
Volume 14, Issue 1, Pages 61-67Publisher
MOSBY-ELSEVIER
DOI: 10.1016/j.jaapos.2009.11.019
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Funding
- New Investigator Award [MSH 55058]
- Canadian Institutes of Health Research [MOP 152588, MOP 57855]
- Department of Ophthalmology and Vision Science at The Hospital for Sick Children
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Skew deviation is a vertical strabismus caused by a supranuclear lesion in the posterior fossa. Because skew deviation may clinically mimic trochlear nerve palsy, it is sometimes difficult to differentiate the 2 conditions. In this review we compare the clinical presentations of skew deviation and trochlear nerve palsy and examine the pathophysiology that underlies skew deviation. We then describe a novel clinical test the upright supine test to differentiate skew deviation from trochlear nerve palsy: a vertical deviation that decreases by >= 50% from the upright to supine position suggests skew deviation and warrants investigation for a lesion in the posterior fossa as the cause of vertical diplopia. (J AAPOS 2010;14:61-67)
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