Evidence map›Paper›PMID 22427598›Full record

ArticleInvestigative ophthalmology & visual science2012

The optic nerve head as a robust biomechanical system.

Ian A Sigal, Richard A Bilonick, Larry Kagemann, Gadi Wollstein, Hiroshi Ishikawa, Joel S Schuman, Jonathan L Grimm

Abstract read
In one paragraph

Article in Investigative ophthalmology & visual science, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 16 papers.

0numbers the graph read from it
0cells of the map it votes in
16citing 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

16 citing papers in PubMed.

  1. Article
  2. Article
  3. Article
  4. Article
  5. Increased Susceptibility to Glaucomatous Damage in Microfibril Deficient Mice.Investigative ophthalmology & visual science · 2020
    Article
  6. Lamina Cribrosa Moves Anteriorly After Trabeculectomy in Myopic Eyes.Investigative ophthalmology & visual science · 2020
    Article
  7. Review
  8. Article
  9. What is a typical optic nerve head?Experimental eye research · 2016
    Article
  10. Use and Misuse of Laplace's Law in Ophthalmology.Investigative ophthalmology & visual science · 2016
    Review
  11. Review
  12. Recent advances in OCT imaging of the lamina cribrosa.The British journal of ophthalmology · 2014
    Review
  13. Article
  14. Article
  15. A few good responses: which mechanical effects of IOP on the ONH to study?Investigative ophthalmology & visual science · 2012
    Article
  16. Review
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

7 authors.

Ian A SigalDepartment of Ophthalmology, UPMC Eye Center, Eye and Ear Institute, Ophthalmology and Visual Science Research Center, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, USA. sigalia@upmc.edu
Richard A Bilonick
Larry Kagemann
Gadi Wollstein
Hiroshi Ishikawa
Joel S Schuman
Jonathan L Grimm

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
Novel Glaucoma Diagnostics for Structure and Function - Renewal - 1R01EY013178 · NEI · WILLS EYE HEALTH SYSTEM · PI Joel S Schuman · 2000 to 2026
$17.5M
NEI NIH HHS P30 EY008098NEI NIH HHS P30-EY008098NEI NIH HHS R01 EY013178
6 · The paper itself

Abstract

Purpose. Understanding the effects of IOP on the optic nerve head (ONH) is important in understanding glaucoma and ONH structure and function. The authors tested the hypothesis that the ONH is a robust biomechanical structure wherein various factors combine to produce a relatively stable response to IOP. Methods. The authors generated two populations of 100,000 ONH numerical models each with randomly selected values, but controlled distributions, either uniform or Gaussian, of ONH geometry and mechanical properties. The authors predicted the lamina cribrosa displacement (LCD), scleral canal expansion (SCE), and the stresses (forces) and deformations (strains) produced by a 10 mm Hg increase in IOP. The authors analyzed the distributions of the responses. Results. The responses were distributed nonuniformly, with the majority of the models having a response within a small region, often less than 30% of the size of the overall response region. This concentration of responses was more marked in the Gaussian population than in the uniform population. All the responses were positively skewed. Whether a particular case was typical or not depended on the response used for classification and on whether the decision was made using one-dimensional or two-dimensional criteria. Conclusions. Despite wide variations in ONH characteristics and responses to IOP, some responses were much more common than others. This supports conceiving of the eye as a robust structure, particularly for LCD and SCE, which is tolerant to variations in tissue geometry and mechanical properties. The authors also provide the first estimates of the typical mechanical response of the ONH to variations in IOP over a large population of ONHs.

Indexed as

Biomechanical PhenomenaElasticityHumansIntraocular PressureModels, TheoreticalNumerical Analysis, Computer-AssistedOptic DiskSclera

Identifiers

PMID22427598
PMCPMC3357115

What OpenQuestion holds

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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.