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Related Concept Videos

Parkinson Disease ll: Pathophysiology01:24

Parkinson Disease ll: Pathophysiology

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...
Parkinson Disease l: Introduction01:24

Parkinson Disease l: Introduction

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 which...
Parkinson's Disease: Treatment01:24

Parkinson's Disease: Treatment

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.
Parkinson's Disease is primarily a result of the loss of dopaminergic neurons in the substantia nigra pars compacta. The cornerstone of its...
Parkinson's Disease: Overview01:15

Parkinson's Disease: Overview

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 to...

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Related Experiment Video

Updated: Jun 3, 2026

Using Retinal Imaging to Study Dementia
09:17

Using Retinal Imaging to Study Dementia

Published on: November 6, 2017

Retinal thickness in Parkinson's disease.

N K Archibald1, M P Clarke, U P Mosimann

  • 1Institute for Ageing and Health, Newcastle University, Campus for Ageing and Vitality, Newcastle upon Tyne, UK. neilarchie@me.com

Parkinsonism & Related Disorders
|April 2, 2011
PubMed
Summary

Optical coherence tomography did not reveal retinal thinning in Parkinson's disease patients, despite visual symptoms. Further research with advanced techniques is needed to confirm its role as a diagnostic biomarker for Parkinson's disease.

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Last Updated: Jun 3, 2026

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In vivo Structural Assessments of Ocular Disease in Rodent Models using Optical Coherence Tomography
07:44

In vivo Structural Assessments of Ocular Disease in Rodent Models using Optical Coherence Tomography

Published on: July 24, 2020

Area of Science:

  • Ophthalmology
  • Neuroscience
  • Medical Imaging

Background:

  • Parkinson's disease (PD) commonly causes visual symptoms, including reduced visual acuity and contrast sensitivity.
  • Retinal thinning, detectable by optical coherence tomography (OCT), is a potential biomarker for neurodegeneration in PD.
  • This study investigated retinal thickness in older PD patients using OCT.

Purpose of the Study:

  • To assess the utility of optical coherence tomography (OCT) in measuring retinal thickness in an older cohort of Parkinson's disease (PD) patients.
  • To compare retinal structure between PD patients and age-matched healthy controls.

Main Methods:

  • Fifty-one PD patients and 25 healthy controls underwent ophthalmological assessment and OCT (Zeiss Stratus 3000™).
  • Macular thickness, volume, and peripapillary retinal nerve fiber thickness were measured.
  • Data exclusion criteria included co-morbid ocular pathology, poor OCT tolerability, or poor scan quality.

Main Results:

  • Despite reduced visual acuity and contrast sensitivity in PD patients, no significant differences in retinal thickness were found between PD and control groups.
  • This finding contrasts with some previous research suggesting retinal thinning in PD.

Conclusions:

  • Technical challenges and the lack of observed differences indicate limitations of current OCT techniques for PD biomarker detection in this cohort.
  • Longitudinal studies utilizing newer OCT technologies are necessary to clarify the role of OCT in diagnosing Parkinson's disease.