Trial reportIndian journal of ophthalmology2017
Repeatability and agreement of five imaging systems for measuring anterior segment parameters in healthy eyes.
Trial report in Indian journal of ophthalmology, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 28 papers.
What it found
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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.
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.
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Who cites it
28 citing papers in PubMed, 48 citations in OpenAlex.
- The effects of mirabegron and anticholinergic treatment on anterior segment and pupillary responses in overactive bladder syndrome.BMC ophthalmology · 2026Article
- Comparison of anterior segment parameter measurements between Sirius Plus and Pentacam AXL.Frontiers in medicine · 2026Article
- Article
- Acute Effects of Cigarette Smoking on Corneal Tomographic and Biometric Parameters: A Prospective Controlled Study.Beyoglu eye journal · 2026Article
- Directional drift in biologically meaningful vector planes: A proposed geometric framework for early detection of subthreshold disease.PloS one · 2026Article
- A prospective comparison of Scheimpflug-based anterior segment imaging systems in normal and abnormal corneas: Oculus Pentacam vs. Remidio Visionix VX650.Frontiers in ophthalmology · 2025Article
- Multi-modal imaging for the detection of early keratoconus: a narrative review.Eye and vision (London, England) · 2024Review
- A comparison of Scansys and Sirius tomography in healthy eyes.BMC ophthalmology · 2024Article
- Comparison of the Accuracy of Seven Vault Prediction Formulae for Implantable Collamer Lens Implantation.Ophthalmology and therapy · 2024Article
- Comparison of corneal measurements using two different Scheimpflug analyzers in Sirius and Pentacam devices.Scientific reports · 2023Observational
- Comparison of Anterior Segment Measurements with a New Multifunctional Unit and Five Other Devices.Korean journal of ophthalmology : KJO · 2022Article
- Anterior Ocular Biometrics Using Placido-scanning-slit System, Rotating Scheimpflug Tomography, and Swept-source Optical Coherence Tomography.Korean journal of ophthalmology : KJO · 2022Article
- Impact of tear optics on the repeatability of Pentacam AXL wave and iTrace in measuring anterior segment parameters and aberrations.Indian journal of ophthalmology · 2022Article
- Correlations among Corneal Biomechanical Parameters, Stiffness, and Thickness Measured Using Corvis ST and Pentacam in Patients with Ocular Hypertension.Journal of ophthalmology · 2022Article
- Reliability and agreement of the central and mid-peripheral corneal thickness measured by a new Scheimpflug based imaging.Annals of translational medicine · 2021Article
- Response to comments on: Repeatability of Orbscan III for anterior segment parameters in normal eyes.Indian journal of ophthalmology · 2021Article
- Sirius Scheimpflug-Placido versus ultrasound pachymetry for central corneal thickness: meta-analysis.Eye and vision (London, England) · 2021Article
- Repeatability of Orbscan III for anterior segment parameters in normal eyes.Indian journal of ophthalmology · 2020Article
- Measurement of central corneal thickness using Orbscan 3, Pentacam HR and ultrasound pachymetry in normal eyes.International ophthalmology · 2020Observational
- The Impact of Changes in Corneal Back Surface Astigmatism on the Residual Astigmatic Refractive Error following Routine Uncomplicated Phacoemulsification.Journal of ophthalmology · 2020Article
Corrections and comments
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Authors and funding
5 authors at 2 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
purposeThe purpose of this study is to assess the repeatability and agreement of five imaging devices, namely, the Pentacam (Oculus), Sirius (CSO), Orbscan IIz (Bausch and Lomb), Corvis (Oculus), and ultrasound pachymetry (UP, Tomey) in measuring steep keratometry (sKm), flat keratometry (fKm), central corneal thickness (CCT), thinnest corneal thickness (TCT), and anterior chamber depth (ACD) in healthy individuals.
designThis was prospective, comparative study. SUBJECTS: Forty-six healthy Indian patients. MATERIALS AND
methodsForty-six eyes of 46 healthy participants underwent three consecutive scans on each device by a single examiner. Within-subject standard deviation, test-retest repeatability (TRT), and coefficient of variation (COV) for assessing repeatability and Bland-Altman plots for the agreement between the mean measurements of each machine were analyzed.
main outcome measuresThe repeatability and agreement between the five devices for the measurements of sKm, fKm, CCT, TCT, and ACD.
resultsThe TRT of sKm measurements ranged between 0.23 diopter (D) (with Pentacam) and 0.83 D (with Orbscan). The same of fKm, TCT, ACD, and CCT measurements ranged between 0.28 D (with Pentacam) and 0.74 D (with Sirius), 7.78 μm (Sirius) and 19.81 μm (Orbscan), 0.05 mm (Orbscan) and 0.07 (Sirius), and 7.36 μm (Sirius) and 18.02 μm (Orbscan), respectively. The TRT of sKm and fKm measurements with Pentacam was significantly lower than those with Orbscan and Sirius. The TRT of TCT measurement with Sirius was significantly lower than that with Pentacam (4.53 μm) and Orbscan (7.15 μm). There were statistically significant differences in the mean measurements of all parameters between the devices. The 95% limit of agreement on the Bland-Altman analysis was wide for the measurement pairs with all the devices. Significant proportional bias in the agreement was detected for TCT measurements with all the device pairs and for the ACD measurements between Sirius and Pentacam.
conclusionsThe repeatability estimates of sKm, fKm, TCT, ACD, and CCT measurements with Pentacam, Orbscan, Sirius, Corvis, and UP in Indian eyes were good. However, the differences in the measurements between the devices were statistically significant and the same cannot be used interchangeably for anterior segments measurements.
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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.