Palsy of "fast" and "slow" vergence by pontine lesions
Holger Rambold1, Thurid Sander, Gunnar Neumann
1Department of Neurology, University of Luebeck, Ratzeburger Allee 160, D-23538 Luebeck, Germany. Holger.Rambold@neuro.uni-luebeck.de
Abstract:
The role of pontine nuclei in vergence eye movements to "step" targets ("fast" vergence) is unknown. Eye movements were recorded in two patients with unilateral pontine infarctions and in 11 healthy controls. In addition to the deficit of "slow" vergence, "fast" vergence was particularly impaired. However, conjugate saccades did not differ from controls, but smooth pursuit eye movements did. The authors conclude that "fast" vergence palsy is not only caused by midbrain but also upper pontine lesions.
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