Evidence map›Paper›PMID 40329769›Full record

Observational studyKorean journal of ophthalmology : KJO2025

Assessment of Tonometry Methods in Keratoconic Eyes Following Intracorneal Ring Segments Implantation: A Comparative Study.

Siamak Zarei-Ghanavati, Seyed Mehdi Tabatabaei, Samaneh Gholamhoseinpour-Omran, Hamed Hosseinikhah-Manshadi, Saeed Banan, Mehdi Aminizade, Kosar Esmaili, Ebrahim Azaripour

Abstract readComparative StudyObservational Study
PubMed Full text at PMC Publisher
In one paragraph

Observational study in Korean journal of ophthalmology : KJO, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.

0numbers the graph read from it
0cells of the map it votes in
1citing 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

1 citing paper in PubMed.

  1. 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

8 authors.

Siamak Zarei-GhanavatiEye Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
Seyed Mehdi TabatabaeiGlaucoma Service, Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran, Iran.
Samaneh Gholamhoseinpour-OmranEye Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
Hamed Hosseinikhah-ManshadiEye Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
Saeed BananEye Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
Mehdi AminizadeGlaucoma Service, Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran, Iran.
Kosar EsmailiGlaucoma Service, Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran, Iran.
Ebrahim AzaripourGlaucoma Service, Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran, Iran.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

purposeTo compare intraocular pressure (IOP) readings from corneas with intracorneal corneal ring segments (ICRS) using various methods, including Goldmann applanation tonometry (GAT), Tonopen, corneal-compensated IOP from the Ocular Response Analyzer (ORA), and biomechanically corrected IOP from the Corneal Visualization Scheimpflug Technology (Corvis ST).

methodsThis cross-sectional observational study included participants who had undergone ICRS implantation with KeraRing at least 3 months before the study. The mean IOP recorded by different instruments was compared using analysis of variance. Agreement among the methods was assessed with Bland-Altman plots.

resultsA total of 54 eyes from 27 participants were enrolled. The mean IOP measured by Tonopen was significantly lower in the center compared to the peripheral quadrants (p < 0.001). IOP measured by GAT was significantly lower than that measured by Tonopen (13.02 ± 2.31 mmHg vs. 14.50 ± 2.91 mmHg, p = 0.021). There were no significant differences between the IOP measurements provided by Tonopen, ORA, and Corvis ST. The corneal-compensated IOP from ORA and biomechanically corrected IOP from Corvis ST had the highest correlation, with a weak intraclass correlation coefficient of 0.38.

conclusionsIOP measurements using Tonopen were significantly lower in the central 5-mm zone compared to other quadrants. GAT measurements were significantly lower than those from Tonopen. Different measurement tools did not show a strong correlation. Corvis ST (biomechanically corrected IOP) tended to present lower readings at higher IOP levels in eyes with ICRS.

Indexed as

CorneaCorneal StromaIntraocular PressureKeratoconusProstheses and ImplantsProsthesis ImplantationTonometry, OcularAdultCorneal TopographyCross-Sectional StudiesFemaleHumansMaleMiddle AgedYoung AdultBiomechanically corrected intraocular pressureCorneal-compensated intraocular pressureIntracorneal ring segmentsIntraocular pressureKeratoconus

Identifiers

PMID40329769
PMCPMC12178681

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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 OpenQuestion graph.