Fast vergence eye movements are disrupted in Parkinson's disease: A video-oculography study
Jaromír Hanuška1, Cecilia Bonnet2, Jan Rusz3
1Dept. of Neurology and Center of Clinical Neuroscience, Charles University in Prague, 1st Faculty of Medicine and General University Hospital, Prague, Czech Republic; Dept. of Neurosurgery, Hospital Na Homolce, Prague, Czech Republic.
Background:
Blurred near vision is a common non-motor symptom in patients with Parkinson's disease (PD), however detailed characterization of vergence eye movements (VEM) is lacking.
Methods:
Convergence and divergence were examined in 18 patients with PD and 18 control subjects using infrared video-oculography. VEM metrics analyzed included latency, velocity and accuracy, in vertical and horizontal planes.
Results:
The latency of convergence and divergence was significantly increased in PD subjects. Additionally, divergence was slow and hypometric, while other convergence metrics were similar to controls.
Conclusion:
We provide evidence in favor of disrupted VEM in PD.
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