Progress and Prospects in Parkinson's Research/Symptoms/Blepharospasm

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Blepharospasm
Spasm of the eyelid

The following references are relevant:-

Elston (1992) A new variant of blepharospasm

Hallett et al (2008)  ..Update on blepharospasm: Report from the BEBRF International Workshop

Armstrong (2011) Visual symptoms in Parkinson's Disease