ArticleIndian journal of ophthalmology2022
Impact of tear optics on the repeatability of Pentacam AXL wave and iTrace in measuring anterior segment parameters and aberrations.
Article in Indian journal of ophthalmology, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 12 papers.
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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.
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Who cites it
12 citing papers in PubMed, 15 citations in OpenAlex.
- Influence of artificial tears on corneal parameter measurement using three different devices: Keratometry and Scheimpflug technology, a randomized trial.Acta ophthalmologica · 2025Trial
- Comparative analysis of subjective and objective visual quality after LASEK, FS-LASIK, and TransPRK.Lasers in medical science · 2026Article
- Establishing a precision reference benchmark for corneal epithelial aberration measurements using a new hybrid device across keratoconus stages.Eye and vision (London, England) · 2026Article
- Comparison of corneal topography maps of a swept-source OCT biometer and a Scheimpflug device.International ophthalmology · 2026Article
- Aberrometric and Visual Outcomes Following Planned Axis Flip versus No Axis Flip During Toric Intraocular Lens Implantation: A Comparative Observational Study.Clinical ophthalmology (Auckland, N.Z.) · 2026Article
- Normative Data of Higher-Order Aberrations in Healthy Caucasian Eyes and Their Correlation with Age, Gender, and Spherical Equivalent.Clinical ophthalmology (Auckland, N.Z.) · 2026Article
- A Practical Approach for Optimizing Ocular Surface Status Before Cataract Surgery to Improve Visual Outcomes and Reduce the Risk of Postoperative Dry Eye.Ophthalmology and therapy · 2025Review
- Swept-source optical coherence tomography in ocular surface diseases: anterior segment analysis repeatability and its limits.Frontiers in medicine · 2024Article
- Commentary: Predictors of outcomes after corneal collagen cross linking: Present, and future directions.Indian journal of ophthalmology · 2022Article
- Commentary: Effect of dry eyes on the corneal diagnostic measurements.Indian journal of ophthalmology · 2022Article
- Comparison of Total Corneal Astigmatism between IOLMaster and Pentacam.BioMed research international · 2022Article
- Impact of tear film stability on corneal refractive power measurement and surgical planning for cataract.Advances in ophthalmology practice and researchArticle
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Authors and funding
7 authors at 2 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Purpose: To assess impact of tear optics on repeatability of a Scheimpflug device with a Hartmann Shack aberrometer and a ray tracing aberrometer. Methods: One hundred healthy and 100 postrefractive surgery eyes underwent dry eye evaluation including Schirmer's test and tear film break-up time (TBUT). They underwent optical quality analyzer (OQAS, Visio metrics S.L, Terrassa, Spain) to assess objective scatter index (OSI), three scans each on Pentacam AXL wave (OCULUS Optikgerate Gmbh, Wetzlar, Germany), iTrace (Tracey™ Technologies, Texas, USA) for flat, steep keratometry, thinnest corneal thickness, root mean square higher-order aberrations (RMS HOA), RMS lower-order aberrations (LOA), spherical aberrations, RMS COMA. Repeatability of Pentacam AXL wave and iTrace in healthy and postrefractive eyes (OSI >1 vs OSI <1) was studied using within-subject standard deviation (Sw) test-retest repeatability (TRT), coefficient of variation (COV). Results: OSI showed an inverse association with TBUT (P < 0.001). All measurements with Pentacam AXL wave with OSI < 1 had excellent repeatability, intraclass correlation coefficient (ICC) ranging from 0.88 for HOA, to 0.92 for LOA. The Sw, TRT, and COV of all aberration measurements were significantly lower (better) than those of iTrace. In eyes with OSI ≥1, the repeatability with Pentacam AXL wave dropped with ICC ranging from 0.77 for HOA, to 0.84 for LOA with lower Sw, TRT, and COV of all aberration measurements as compared to iTrace. Maximum variation was seen with HOA and minimum with LOA. Conclusion: Tear optics affected repeatability of Pentacam wave and iTrace. Pentacam wave had better repeatability in eyes with a poor tear film as compared to iTrace. Thus, the tear film can impact repeatability of an instrument and it is important to assess the tear film prior to imaging patients, which can change the way we interpret and image these patients.
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