Evidence map›Paper›PMID 28146238›Full record

ArticleInvestigative ophthalmology & visual science2017

Collagen Architecture of the Posterior Pole: High-Resolution Wide Field of View Visualization and Analysis Using Polarized Light Microscopy.

Ning-Jiun Jan, Kira Lathrop, Ian A Sigal

Abstract read
In one paragraph

Article in Investigative ophthalmology & visual science, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 68 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
68citing papers in PubMed, 1 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

68 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Critical Systematic Review of 3D Bioprinting in Biomedicine.International journal of molecular sciences · 2025
    Pooled it
  2. Trial
  3. Real-Time Ferroelectric Domain Wall Dynamics During Electric Poling and Depoling.Advanced science (Weinheim, Baden-Wurttemberg, Germany) · 2026
    Article
  4. Article
  5. Review
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  7. Observational
  8. Article
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  11. Ocular Biomechanical Responses to Long-Duration Spaceflight.IEEE open journal of engineering in medicine and biology · 2025
    Article
  12. Article
  13. Article
  14. Article
  15. Article
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8 more citing papers are in PubMed but not listed here.

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

3 authors.

Ning-Jiun JanDepartment of Ophthalmology, University of Pittsburgh, Pittsburgh, Pennsylvania, United States 2Department of Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania, United States.
Kira LathropDepartment of Ophthalmology, University of Pittsburgh, Pittsburgh, Pennsylvania, United States 2Department of Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania, United States.
Ian A SigalDepartment of Ophthalmology, University of Pittsburgh, Pittsburgh, Pennsylvania, United States 2Department of Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania, United States.

Funding

Virus Production and Manipulation of Protein/Gene Expression ModuleP30EY008098 · NEI · UNIVERSITY OF PITTSBURGH AT PITTSBURGH · PI Ethan A Rossi · 1989 to 2026
$17.8M
Optic nerve head microstructure, biomechanics and susceptibility to glaucomaR01EY023966 · NEI · UNIVERSITY OF PITTSBURGH AT PITTSBURGH · PI Ian A Sigal · 2014 to 2026
$3.8M
Interplay between intraocular and cerebrospinal fluid pressure effects on the optic nerve head in vivoR01EY025011 · NEI · UNIVERSITY OF PITTSBURGH AT PITTSBURGH · PI SIGAL, IAN A, WOLLSTEIN, GADI · 2015 to 2018
$1.5M
Nanoparticles as OCT Contrast AgentsR21EY019092 · NEI · UNIVERSITY OF PITTSBURGH AT PITTSBURGH · PI WOLLSTEIN, GADI · 2009 to 2010
$388k
CIHR 1234448NEI NIH HHS P30 EY008098NEI NIH HHS R01 EY023966NEI NIH HHS R01 EY025011NEI NIH HHS R21 EY019092
6 · The paper itself

Abstract

Purpose: The purpose of this study was to leverage polarized light microscopy (PLM) to visualize the collagen fiber architecture of posterior pole and optic nerve head with micrometer-scale resolution and to identify and quantify major organizational components. Methods: Eight sheep posterior poles were cryosectioned and imaged using PLM. Collagen fiber orientation was determined by using custom scripts, and the resulting orientation maps were inspected and quantified to identify major structural elements and tested for differences in mean fiber orientation and anisotropy, using linear mixed effect models. Results: Images revealed an intricate organization of collagen fibers in the posterior pole. In the lamina cribrosa, interweaving fibers formed large knots and wrapped around nerve fiber pores, with beam insertions into the scleral canal wall that were either narrow and straight or wide. In the peripapillary sclera, three significantly different (P < 0.0001) components were identified: fibers oriented circumferentially proximal to the canal, radially in the innermost sclera, and unaligned with interweaving fibers. The radial fibers were between 60 and 180 μm thick, extending at least 3 mm from the canal. Conclusions: PLM revealed structural aspects of the lamina cribrosa and sclera that may have important biomechanical roles but that were previously unreported or not characterized quantitatively. In the lamina cribrosa, these roles included wide and narrow beam insertions and details of collagen fibers interweaving and wrapping around the pores. In the sclera, we described regions of circumferential, radial, and unaligned "random" fibers. Although there is consensus that circumferential fibers protect neural tissues by resisting canal expansion, the role of the radial fibers remains unclear.

Indexed as

AnimalsCollagenLinear ModelsMicroscopy, PolarizationModels, AnimalModels, BiologicalOptic DiskScleraSheepCollagen

Identifiers

PMID28146238
PMCPMC5295768

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC-ND
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.