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Related Experiment Video

Updated: Feb 28, 2026

Characterizing the Relationship Between Eye Movement Parameters and Cognitive Functions in Non-demented Parkinson's Disease Patients with Eye Tracking
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Color Vision Deficits and Binocular Vision Dysfunction in Parkinson's Disease.

Julia Mleczek1, Anim Forjindam1, Aasef Shaikh2,3

  • 1School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA.

Brain Sciences
|February 27, 2026
PubMed
Summary
This summary is machine-generated.

Parkinson's Disease (PD) patients show significant binocular vision (BV) and color vision (CV) deficits, including convergence insufficiency exotropia. These visual impairments occur independently of motor symptoms, highlighting the need for routine eye exams in PD patients.

Keywords:
Parkinson’s diseasebinocular visioncolor visioneye movementvergence

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Area of Science:

  • Neuro-ophthalmology
  • Movement Disorders
  • Visual Neuroscience

Background:

  • Visual dysfunction, including color vision (CV) and binocular vision (BV) deficits, is a common non-motor symptom in Parkinson's Disease (PD).
  • Computerized CV tests like the Cambridge Color Test (CCT) are underutilized in PD despite limitations of standard tests.

Purpose of the Study:

  • To investigate binocular vision (BV) and color vision (CV) dysfunction in Parkinson's Disease (PD) patients.
  • To assess the association between visual deficits and disease severity in PD.

Main Methods:

  • 19 PD patients and 12 controls underwent comprehensive eye exams, including ocular motility and the Cambridge Color Test (CCT).
  • Discrimination ellipses were fitted using CCT thresholds along 12 contrast vectors.
  • Findings were compared between groups, and correlations with UPDRS scores were analyzed.

Main Results:

  • PD participants exhibited larger ellipse areas (p=0.012) and increased short-axis lengths (p=0.009) in CCT.
  • Convergence insufficiency exotropia (p<0.001) and impaired stereopsis (p=0.006) were more prevalent in PD patients.
  • No significant correlation was found between BV/CV deficits and UPDRS motor scores.

Conclusions:

  • PD patients demonstrate significant binocular vision dysfunction and selective color vision deficits.
  • Convergence insufficiency exotropia is more common in PD, likely due to neurodegeneration.
  • Visual impairments in PD occur independently of motor severity, necessitating routine visual screening.