Evidence map›Paper›PMID 27794426›Full record

SynthesisAmerican journal of ophthalmology2017

Fornix-Based Versus Limbal-Based Conjunctival Trabeculectomy Flaps for Glaucoma: Findings From a Cochrane Systematic Review.

Christiane E Al-Haddad, Marwan Abdulaal, Ahmad Al-Moujahed, Ann-Margret Ervin, Karine Ismail

Abstract readSystematic Review
In one paragraph

Synthesis in American journal of ophthalmology, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 13 papers.

0numbers the graph read from it
0cells of the map it votes in
13citing 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

13 citing papers in PubMed.

  1. Article
  2. Trends in Glaucoma Fellowship Surgical Experience.Clinical ophthalmology (Auckland, N.Z.) · 2025
    Article
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  4. Article
  5. Observational
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  7. Article
  8. Observational
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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

5 authors.

Christiane E Al-HaddadDepartment of Ophthalmology, American University of Beirut, Beirut, Lebanon. Electronic address: ca12@aub.edu.lb.
Marwan AbdulaalDepartment of Ophthalmology, American University of Beirut, Beirut, Lebanon.
Ahmad Al-MoujahedDepartment of Ophthalmology, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, Massachusetts.
Ann-Margret ErvinDepartment of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland.
Karine IsmailDepartment of Ophthalmology, American University of Beirut, Beirut, Lebanon.

Funding

Comparative Effectiveness Research & the Cochrane Eyes & Vision GroupU01EY020522 · NEI · JOHNS HOPKINS UNIVERSITY · PI DICKERSIN, KAY · 2010 to 2016
$9.2M
NEI NIH HHS U01 EY020522
6 · The paper itself

Abstract

purposeTo compare effectiveness of fornix- and limbal-based conjunctival flaps in trabeculectomy surgery.

designSystematic review.

methodsSetting: CENTRAL, MEDLINE, LILACS, ISRCTN registry, ClinicalTrials.gov, WHO, and ICTRP were searched to identify eligible randomized controlled trials (RCTs). STUDY POPULATION: RCTs in which benefits and complications of fornix- vs limbal-based trabeculectomy for glaucoma were compared in adult glaucoma patients. OBSERVATION PROCEDURE: We followed Cochrane methodology for data extraction.

main outcome measuresProportion of failed trabeculectomies at 24 months, defined as the need for repeat surgery or uncontrolled intraocular pressure (IOP) >22 mm Hg, despite topical/systemic medications.

resultsThe review included 6 trials with a total of 361 participants, showing no difference in effectiveness between fornix-based vs limbal-based trabeculectomy surgery, although with a high level of uncertainty owing to low event rates. In the fornix-based and limbal-based surgery, mean IOP at 12 months was similar, with ranges of 12.5-15.5 mm Hg and 11.7-15.1 mm Hg, respectively. Mean difference was 0.44 mm Hg (95% CI -0.45 to 1.33) and 0.86 mm Hg (95% CI -0.52 to 2.24) at 12 and 24 months of follow-up, respectively. Mean number of postoperative glaucoma medications was similar between the 2 groups. Mean difference was 0.02 (95% CI -0.15 to 0.19) at 12 months. As far as postoperative complications, an increased risk of shallow anterior chamber was observed in the limbal-based group.

conclusionSimilar efficacy of trabeculectomy surgery with respect to bleb failure or IOP control was observed in both types of conjunctival flap incisions. A significant difference was detected in the risk of postoperative shallow anterior chamber, which was increased in the limbal-based group.

Indexed as

Surgical FlapsConjunctivaGlaucomaHumansLimbus CorneaeTrabeculectomy

Identifiers

PMID27794426
PMCPMC5321540

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.