Impact of tear optics on the repeatability of Pentacam AXL wave and iTrace in measuring anterior segment parameters and aberrations

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dc.contributor.authorKundu, Gairiken_US
dc.contributor.authorShetty, Rohiten_US
dc.contributor.authorKhamar, Pooja1en_US
dc.contributor.authorGupta, Sneha1en_US
dc.contributor.authorMullick, Ritikaen_US
dc.contributor.authorGanesan, Vaitheeswaran L2en_US
dc.contributor.authorD扴ouza, Sharonen_US
dc.date.accessioned2023-08-25T06:32:40Z
dc.date.available2023-08-25T06:32:40Z
dc.date.issued2022-04
dc.description.abstractPurpose: 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抯 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杛etest 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.en_US
dc.identifier.affiliationsDepartments of Cornea and Refractive Surgery, Narayana Nethralaya, Bengaluru, Karnataka, Indiaen_US
dc.identifier.affiliationsCataract and Refractive Surgery, Narayana Nethralaya, Bengaluru, Karnataka, Indiaen_US
dc.identifier.affiliationsDepartment of Cornea, External Disease and Refractive Surgery, The Ottawa Hospital (TOH) and Precision Cornea Centre, Ottawa, Canadaen_US
dc.identifier.citationKundu Gairik, Shetty Rohit, Khamar Pooja1, Gupta Sneha1, Mullick Ritika, Ganesan Vaitheeswaran L2, D扴ouza Sharon. Impact of tear optics on the repeatability of Pentacam AXL wave and iTrace in measuring anterior segment parameters and aberrations. Indian Journal of Ophthalmology. 2022 Apr; 70(4): 1150-1157en_US
dc.identifier.issn1998-3689
dc.identifier.issn0301-4738
dc.identifier.placeIndiaen_US
dc.identifier.urihttps://imsear.searo.who.int/handle/123456789/224264
dc.languageenen_US
dc.publisherAll India Ophthalmological Societyen_US
dc.relation.issuenumber4en_US
dc.relation.volume70en_US
dc.source.urihttps://doi.org/10.4103/ijo.IJO_2153_21en_US
dc.subjectAberrationsen_US
dc.subjectiTraceen_US
dc.subjectOSIen_US
dc.subjectPentacam AXL waveen_US
dc.subjectrepeatabilityen_US
dc.titleImpact of tear optics on the repeatability of Pentacam AXL wave and iTrace in measuring anterior segment parameters and aberrationsen_US
dc.typeJournal Articleen_US
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