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Related Concept Videos

Parkinson's Disease: Overview01:15

Parkinson's Disease: Overview

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Neurodegenerative disorders are progressive diseases that cause irreversible damage and loss to neurons in specific brain areas. Examples of these disorders include Parkinson's disease, Alzheimer's disease, Multiple Sclerosis (MS), and Amyotrophic Lateral Sclerosis (ALS). These disorders share characteristics such as proteinopathies, selective neuronal vulnerability, and a complex interplay between genetic and environmental factors. The primary therapeutic goal for these conditions is...
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Parkinson Disease l: Introduction01:24

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Parkinson’s disease is a chronic, progressive neurodegenerative disorder that primarily affects movement. It is characterized by motor symptoms such as resting tremors, muscle rigidity, bradykinesia (slowness of movement), and postural instability. Patients may notice hand tremors at rest, stiffness during movement, or a shuffling gait. In addition to motor features, non-motor symptoms include sleep disturbances, mood and behavioral changes, constipation, and cognitive impairment, all of...
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Parkinson Disease ll: Pathophysiology01:24

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Parkinson disease (PD) is a progressive neurodegenerative disorder primarily affecting movement, with additional non-motor features. Its pathophysiology involves complex interactions among genetic susceptibility, environmental exposures, and cellular dysfunction, including dopaminergic neuron loss, protein aggregation, and mitochondrial impairment.Selective NeurodegenerationA key feature is the degeneration of dopaminergic neurons in the substantia nigra pars compacta, leading to reduced...
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Parkinson's Disease: Treatment01:24

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Neurodegenerative disorders, such as Parkinson's Disease (PD), involve the gradual and irreversible destruction of neurons in particular brain areas. These disorders exhibit standard features like proteinopathies, selective vulnerability of some neurons, and an interaction of intrinsic properties, genetics, and environmental influences in neural injury.
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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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Related Experiment Video

Updated: May 3, 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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Visual problems in Parkinson's disease: A questionnaire survey.

S A McDowell1, J P Harris1

  • 1Department of Psychology, The University of Reading, Earley Gate, Whiteknights, Reading RG6 6AL, UK.

Behavioural Neurology
|February 4, 2014
PubMed
Summary

Parkinson's disease patients frequently report visual perception changes, particularly with depth, motion, and hallucinations. These findings highlight vision issues in Parkinson's disease (PD) beyond motor symptoms.

Keywords:
Parkinson's diseaseQuestionnairesVision

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Clinical Neurology

Background:

  • Parkinson's disease (PD) is a neurodegenerative disorder primarily affecting motor function.
  • Visual disturbances are increasingly recognized as non-motor symptoms in PD.
  • Understanding these visual changes is crucial for comprehensive patient care.

Purpose of the Study:

  • To investigate self-reported changes in visual perception among individuals with Parkinson's disease.
  • To compare the incidence of specific visual symptoms between Parkinson's disease patients and healthy controls.
  • To explore the relationship between Parkinson's disease and altered visual processing.

Main Methods:

  • A questionnaire-based study involving 53 individuals with suspected Parkinson's disease and 31 age-matched healthy controls.
  • Participants reported on various aspects of their visual perception.
  • Statistical analysis was used to compare symptom frequencies between the patient and control groups.

Main Results:

  • Parkinson's disease patients reported significantly more issues with depth and motion perception compared to controls.
  • Higher incidence of hallucinations, double vision, and peripheral visual field difficulties were noted in the PD group.
  • No significant differences were found in reported changes related to brightness, color, shape, or size perception.

Conclusions:

  • Self-reported visual perception deficits are common in Parkinson's disease.
  • Specific visual impairments, including depth/motion perception and hallucinations, are significantly associated with Parkinson's disease.
  • These findings underscore the importance of assessing visual function in Parkinson's disease management.