Evidence map›Paper›PMID 33174132›Full record

SynthesisJournal of neurology2021

Central retina changes in Parkinson's disease: a systematic review and meta-analysis.

Lele Huang, Dan Zhang, Jianling Ji, Yujie Wang, Ruijun Zhang

Abstract readMeta-AnalysisSystematic Review
PubMed Publisher
In one paragraph

Synthesis in Journal of neurology, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 36 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
36citing papers in PubMed, 2 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

36 citing papers in PubMed, 2 syntheses or guidelines pooled it.

  1. Pooled it
  2. Pooled it
  3. Article
  4. Review
  5. Article
  6. Article
  7. Review
  8. Article
  9. Optic Disc Pallor in Parkinson's Disease: A UK Biobank Study.Movement disorders : official journal of the Movement Disorder Society · 2025
    Article
  10. Article
  11. Review
  12. Article
  13. Dynamics of retinal changes in early-stage Parkinson's disease.Acta neuropathologica communications · 2025
    Article
  14. Review
  15. Article
  16. Article
  17. Review
  18. Article
  19. Article
  20. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

5 authors.

Lele HuangDepartment of Ophthalmology, The First Hospital of China Medical University, 155 Nanjingbei Street, Heping District, Shenyang, 110001, People's Republic of China.
Dan ZhangDepartment of Neurology, People's Hospital, China Medical University, 33 Wenyi Road, Shenhe District, Shenyang, 110016, People's Republic of China.
Jianling JiDepartment of Neurology, People's Hospital, China Medical University, 33 Wenyi Road, Shenhe District, Shenyang, 110016, People's Republic of China.
Yujie WangDepartment of Neurology, People's Hospital, China Medical University, 33 Wenyi Road, Shenhe District, Shenyang, 110016, People's Republic of China.
Ruijun ZhangDepartment of Ophthalmology, The First Hospital of China Medical University, 155 Nanjingbei Street, Heping District, Shenyang, 110001, People's Republic of China. zhangruijun196502@163.com.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

background and purposeCentral retina imaging is important for early Parkinson's disease (PD) recognition. We aimed to investigate central retina changes using spectral domain-optical coherence tomography (SD-OCT) in PD patients.

methodsWe systematically searched PubMed and EMBASE to identify studies comparing the whole or individual layer thickness of central retina between PD patients and health controls using SD-OCT from inception to April 25, 2020. Data were extracted at eye level. We pooled the mean difference with random effects model. Subgroup analysis and mete-regression were done to detect possible source of heterogeneity.

resultsWe included 27 studies (28 sets of data) enrolling 1470 PD patients (2288 eyes) and 1552 health controls (2524 eyes) in our meta-analysis. Compared with control eyes, the whole thickness of central retina decreased significantly at fovea center by mean difference - 2.70 μm (95% CI [- 4.87, - 0.53], p = 0.01) and in all quadrants in PD eyes. The combination of ganglion cell layer and inner plexiform layer thinned by an average mean difference of - 3.17 μm (95% CI [- 5.07, - 1.26], p = 0.001). The nerve fiber layer thinned by an average mean difference - 0.66 μm (95% CI [- 1.09 to - 0.23], p = 0.003). There was no significant difference in the thickness of inner nuclear layer, outer plexiform layer and outer nuclear layer between eyes of PD and controls. The results of subgroup analysis and mete-regression were consistent.

conclusionThe whole thickness, the thickness of the combination of ganglion cell layer and inner plexiform layer, and nerve fiber layer of central retina decreased significantly in PD patients.

Indexed as

Parkinson DiseaseHumansPubMedRecognition, PsychologyRetinaTomography, Optical CoherenceCentral retinaParkinson’s diseaseSpectral domain-optical coherence tomography

Identifiers

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.