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In this article, we demonstrate that progressive supranuclear palsy patients exhibit pathologically decreased pupil diameters after dark adaptation recorded by TV pupillography. A cut off value of 3.99 mm was defined to differentiate progressive supranuclear palsy patients from patients with other extrapyramidal disorders like Parkinson's disease and multiple system atrophy with a specificity of 86.4% and a sensitivity of 70.8%. Other pupil abnormalities could not be described in patients with extrapyramidal syndromes. \u00a9 2007 Movement Disorder Society<\/jats:p>","DOI":"10.1002\/mds.21721","type":"journal-article","created":{"date-parts":[[2007,9,12]],"date-time":"2007-09-12T19:16:44Z","timestamp":1189624604000},"page":"2123-2126","source":"Crossref","is-referenced-by-count":26,"title":["Pupil diameter in darkness differentiates progressive supranuclear palsy (PSP) from other extrapyramidal 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