Evidence mapPaperPMID 40908012Full record

ArticleBMJ open2025

Methods for the evaluation of corneal nerve fibres in diabetes mellitus by in vivo confocal microscopy: a scoping review.

Siv A Sandvik, Tove Lise Morisbakk, Eilin Lundanes, Jorunn Lid, Neil Lagali, Vibeke Sundling

Abstract readScoping Review
In one paragraph

Article in BMJ open, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.

0numbers the graph read from it
0cells of the map it votes in
5citing papers in PubMed
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

5 citing papers in PubMed.

  1. Review
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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

6 authors.

Siv A SandvikDepartment of Optometry, Radiology and Lighting Design, University of South-Eastern Norway, Kongsberg, Norway siv.a.sandvik@usn.no.ORCID http://orcid.org/0000-0003-2270-313X
Tove Lise MorisbakkDepartment of Optometry, Radiology and Lighting Design, University of South-Eastern Norway, Kongsberg, Norway.ORCID http://orcid.org/0000-0002-6542-4280
Eilin LundanesDepartment of Optometry, Radiology and Lighting Design, University of South-Eastern Norway, Kongsberg, Norway.ORCID http://orcid.org/0009-0000-3872-5531
Jorunn LidDepartment of Optometry, Radiology and Lighting Design, University of South-Eastern Norway, Kongsberg, Norway.ORCID http://orcid.org/0009-0008-7629-1330
Neil LagaliDepartment of Biomedical and Clinical Sciences, Linköping University, Linkoping, Sweden.ORCID http://orcid.org/0000-0003-1079-4361
Vibeke SundlingDepartment of Optometry, Radiology and Lighting Design, University of South-Eastern Norway, Kongsberg, Norway.ORCID http://orcid.org/0000-0002-9567-239X

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

aimTo map, summarise and analyse the methodologies of corneal nerve fibre imaging in studies using in vivo confocal microscopy (IVCM) in diabetes and assess the potential for standardising methods and reporting.

methodsA scoping review was conducted using five databases, MEDLINE, Embase, Cochrane, Web of Science and Scopus, with search terms related to IVCM, diabetes and corneal nerves. Two researchers independently screened the studies for eligibility. Relevant data were extracted and systematically analysed.

resultsOut of 1533 screened articles, 195 met the inclusion criteria. Spanning from 2000 to 2024, the studies showed high variability in image acquisition, image processing, image analysis and reporting detail. Most studies used laser scanning confocal microscopy, examining the central cornea in both eyes in patients with type 2 diabetes, manually selecting 3-6 images from each eye, and using ACCMetrics and CCMetrics for quantifying corneal nerve fibre length in mm/mm

conclusionIVCM studies of corneal nerve fibres in diabetes show substantial methodological heterogeneity and inconsistent reporting, limiting reproducibility. We propose a guideline to support standardisation and improve the reliability of future research.

Indexed as

CorneaDiabetes Mellitus, Type 2Diabetic NeuropathiesNerve FibersHumansMicroscopy, ConfocalReproducibility of ResultsDIABETES & ENDOCRINOLOGYMethodsProtocols & guidelinesReview

Identifiers

PMID40908012
PMCPMC12414215

What Socratic holds

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Registered trials

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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 Socratic graph.