ArticleNeurological sciences : official journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology2025
Eye movement abnormalities in Parkinson's disease motor subtypes: a video-oculographic study.
Article in Neurological sciences : official journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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3 citing papers in PubMed.
- Eye-Tracking Assessment of Visual, Oculomotor, and Pupillary Biomarkers During Reading in Parkinson's Disease.Life (Basel, Switzerland) · 2026Article
- Pace-Induced Saccades in Essential Tremor Differ from Those in Parkinson's Disease and Degenerative Ataxias.Journal of clinical medicine · 2026Article
- EYE movement abnormalities in Parkinson's disease: optometric screening and rehabilitation.Clinical parkinsonism & related disorders · 2026Review
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7 authors.
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Abstract
introductionEye movement dysfunction has been described in Parkinson's disease (PD), but differences between tremor-dominant (TD) and postural instability/gait difficulty (PIGD) PD motor subtypes remain poorly understood. The aim of this study was thus to compare video-oculographic (VOG) features between PD motor subtypes.
methodsTwo hundred and four PD patients and 55 age-matched healthy control subjects (HC) were enrolled in this study. PD patients were stratified into PIGD and TD motor subtype groups. VOG amplitude, peak velocity of upward, downward, and vertical saccades, and square wave jerks (SWJ) number and amplitude were compared across groups. Multivariate linear models also investigated associations between VOG parameters and motor severity, gait/balance disturbances, dopaminergic treatment, and cognitive function.
resultsThe final cohort included 180 PD patients classified as PIGD (n = 121) or TD subtype (n = 59) and 55 HC. Both PD subtypes showed reduced upward and downward amplitude compared to HC, with normal peak velocity. PIGD patients exhibited significantly decreased upward saccadic amplitude compared to TD patients, with no differences in other VOG parameters. Moreover, the upward saccadic amplitude was associated with motor severity, particularly slowness of gait and bradykinesia/rigidity scores, as well as with levodopa equivalent daily dose (LEDD) in the PIGD group. DISCUSSION: This study provides evidence of greater saccadic hypometria in PIGD than in TD patients in upward gaze, contributing to a better understanding of oculomotor impairment in PD. The association of saccadic amplitude with bradykinesia/rigidity severity and LEDD may suggest a role of underlying dopaminergic deficits in ocular dysfunction in PD patients.
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