Advanced Eye Movement Features Measured by Quantitative Oculography as Candidate Biomarkers for Progressive Supranuclear Palsy.

Conventional qualitative eye movement examinations may miss subtle abnormalities, complicating early and accurate diagnosis of progressive supranuclear palsy (PSP). Quantitative oculography, represented by video-oculography (VOG), provides an objective digital assessment of eye movements. This review summarizes abnormalities in advanced eye movement tasks in PSP, including prosaccades (ProSs), antisaccades (ASs), memory-guided saccades (MGSs), predictive saccades (PSs), overlap saccades (OSs) and gap saccades (GSs), and considers their underlying pathophysiological mechanisms. Quantitative metrics from these tasks may help distinguish PSP subtypes and PSP from other neurodegenerative diseases, such as Parkinson's disease (PD), multiple system atrophy (MSA), corticobasal degeneration (CBD) and Alzheimer's disease (AD). Advanced eye movement measures are therefore promising candidate biomarkers for PSP diagnosis and longitudinal disease monitoring.