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Retinal Nerve Fiber Layer Thickness Changes in Parkinson Disease: A Meta-analysis

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01928212
Recruitment Status : Completed
First Posted : August 23, 2013
Last Update Posted : July 18, 2014
Wenzhou Medical University
Information provided by (Responsible Party):
Yifan Feng, Wenzhou Medical University

Brief Summary:
Optical coherence tomography (OCT) is a non-invasive retinal imaging technology that can provide high-resolution cross-sectional images of the peripapillary retinal nerve fiber layer (RNFL) and measure its thickness. A reduction of the RNFL thickness has been detected in several neurodegenerative diseases, such as multiple sclerosis, CADASIL and Alzheimer's disease. Different studies have reported RNFL changes also in Parkinson's disease (PD),a common neurodegenerative disease characterized by motor dysfunctions, originally described by James Parkinson in 1817. PD is characterized by selective dopaminergic neuronal cells loss, which may correlate with RNFL thinning. Previous studies on this subject, however, reported contradicting results. Some investigations reported reductions of the RNFL thickness while others did not. In the present study, in order to determine whether RNFL thickness is reduced in PD patients, we performed a meta-analysis and systematically evaluated RNFL thickness measurements with OCT in a series of PD patients and in the healthy control groups.

Condition or disease Intervention/treatment
Parkinson Disease Device: Optical coherence tomography

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Study Type : Observational
Actual Enrollment : 500 participants
Observational Model: Case Control
Time Perspective: Retrospective
Official Title: Retinal Nerve Fiber Layer Thickness Changes in Parkinson Disease: A Meta-analysis
Study Start Date : August 2013
Actual Primary Completion Date : January 2014
Actual Study Completion Date : May 2014

Resource links provided by the National Library of Medicine

Group/Cohort Intervention/treatment
healthy control
Sex- and agematched healthy subjects
Device: Optical coherence tomography
Parkinson group
Patients with Parkinson's disease
Device: Optical coherence tomography

Primary Outcome Measures :
  1. Retinal Nerve Fiber Layer Thickness [ Time Frame: Baseline ]
    Retinal nerve fiber layer thickness included average thickness (360° measurement), temporal quadrant thickness (316-45°), superior quadrant thickness (46-135°), nasal quadrant thickness (136-225°) and inferior quadrant thickness (226-315°)was measured by OCT.

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 80 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Sampling Method:   Probability Sample
Study Population
PD patients and healthy subjects were included and underwent OCT examinations

Inclusion Criteria:

  1. case-control studies;
  2. patients with PD were compared with healthy controls;
  3. all subjects underwent RNFL thickness measurement by OCT;
  4. studies should provide the data of peripapillary RNFL thickness;
  5. sample size ≥10 in each group.

Exclusion Criteria:

  1. authors did not make RNFL measurements;
  2. study without healthy control group;
  3. the outcome values can not be used for meta-analysis;
  4. duplicated articles.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT01928212

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China, Zhejiang
Wenzhou Medical College
Wenzhou, Zhejiang, China, 325000
Sponsors and Collaborators
Yifan Feng
Wenzhou Medical University
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Principal Investigator: Yifan Feng, PhD Wenzhou Medical University

Publications automatically indexed to this study by Identifier (NCT Number):
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Responsible Party: Yifan Feng, Eye Hospital, Wenzhou Medical College, China, Wenzhou Medical University Identifier: NCT01928212     History of Changes
Other Study ID Numbers: FYF20130820
First Posted: August 23, 2013    Key Record Dates
Last Update Posted: July 18, 2014
Last Verified: July 2014
Keywords provided by Yifan Feng, Wenzhou Medical University:
retinal nerve fiber layer thickness
optical coherence tomography
Parkinson disease
Additional relevant MeSH terms:
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Parkinson Disease
Parkinsonian Disorders
Basal Ganglia Diseases
Brain Diseases
Central Nervous System Diseases
Nervous System Diseases
Movement Disorders
Neurodegenerative Diseases