Progress and Prospects in Parkinson's Research/Symptoms/Oculogyric crises

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Oculogyric crises
Attacks of forced deviation of gaze;

The following references are relevant:-

Clough et al (1983)'' Oculogyric crises and parkinsonism. A case of recent onset ''

Furumoto et al (1989)  Oculogyric crisis as an initial symptom of juvenile parkinsonism-like disease 

Wilkaniec et al (2013) ''Toxicity of extracellular secreted alpha-synuclein: Its role in nitrosative stress and neurodegeneration. ''