Corneal topography in preoperative evaluation for laser keratorefractive surgery – a review

Tăbăcaru, Bogdana; Stanca, Tudor Horia

doi:10.22336/rjo.2020.55

Cited by 2 publications

(1 citation statement)

References 11 publications

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“…Modern devices now offer comprehensive full-thickness topography and tomography, including the corneal back surface, curvature maps, and elevation maps. Additionally, specialized tools like the Belin–Ambroísio enhanced ectasia display (BAD) simplify ectasia screening, allowing for the detection of ectatic alterations at early stages ( 8 ). A commonly used technique for refractive candidate evaluation is Scheimpflug imaging.…”

Section: Introductionmentioning

confidence: 99%

Enhancing ectasia screening using advanced AS-OCT: a case series of challenging refractive candidates

Mohr,

Kassumeh,

Luft

et al. 2024

Front. Ophthalmol.

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PurposeEctasia screening in candidates for laser refractive surgery is mandatory during preoperative evaluation. Despite the availability of modern imaging techniques, refractive surgeons often face borderline decisions when patients present with suspicious tomographic findings. This case series presents refractive candidates with suspicious tomographic findings and demonstrates how to interpret them using Scheimpflug imaging and additional anterior segment optical coherence tomography (AS-OCT).SettingDepartment of Ophthalmology, University Hospital, LMU Munich.Case seriesThis case series examines six potential candidates for refractive surgery with a mean age of 29.2 ± 3.9 years, whose corneal assessments using Scheimpflug imaging raised suspicion for ectasia. Each candidate was additionally examined with AS-OCT and reevaluated. The mean manifest subjective spherical equivalent was -3.67 ± 1.8 diopters. The total corneal thickness measured 537 µm ± 30 µm at its thinnest point. None of the candidates had any reported underlying corneal or ophthalmic diseases, and slit lamp examinations revealed no abnormal morphological findings.ConclusionsBoth Scheimpflug imaging and AS-OCT are appropriate tools for screening refractive candidates for ectasia. While topographic and elevation analyses yielded comparable results regarding corneal structure, the epithelial mapping provided by AS-OCT played a critical role in decision-making for cases with borderline tomographic findings. Establishing a global consensus on the use of epithelial mapping in ectasia screening is necessary.

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Section: Introductionmentioning

confidence: 99%

Enhancing ectasia screening using advanced AS-OCT: a case series of challenging refractive candidates

Mohr,

Kassumeh,

Luft

et al. 2024

Front. Ophthalmol.

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Repeatability and Agreement of Anterion with Pentacam HR and Orbscan II in Corneal Parameters after Photorefractive Keratectomy

Ostadi-Moghaddam,

Shandiz,

Validad

et al. 2024

Dubai Med J

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Introduction: This study aimed to evaluate the repeatability and agreement of Anterion with Pentacam HR and Orbscan II in corneal parameters after photorefractive keratectomy (PRK). Methods: This prospective study involved 42 patients (42 eyes) aged between 20 and 40 years undergoing PRK surgery. Corneal measurements were measured two times using Anterion in order to assess the repeatability of this device. Then, the same parameters were measured using Pentacam and Orbscan in order to determine the agreement of Anterion and the other two devices in measuring corneal parameters after PRK. Intraclass correlation coefficient (ICC) checked Anterion’s repeatability. Also, ICC and means of the 95% limits of agreement (LoA) were used to assess the agreement of Anterion results with those of the two other devices. Results: Anterion demonstrated high to moderate repeatability in corneal parameters post-PRK, except for anterior flat keratometry (ICC = 0.73), 4th order root mean square (RMS), and horizontal trefoil (ICC < 0.75). While Anterion and Pentacam showed good agreement in corneal topography and tomography (ICC > 0.90, P < 0.05), they were only interchangeable in keratometric parameters. Additionally, no agreement was observed between Anterion and Pentacam in aberration parameters after PRK. Although Anterion and Orbscan exhibited agreement in anterior average keratometry and central corneal thickness (CCT) (ICC > 0.90, P < 0.05), it was not clinically interchangeable. Conclusion: Anterion demonstrated notable repeatability in most corneal parameters after PRK. Although there was good agreement between Anterion and Pentacam HR in measuring corneal topography and tomography, their interchangeability was limited to other values. Furthermore, Anterion and Orbscan II were not clinically interchangeable.

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Corneal topography in preoperative evaluation for laser keratorefractive surgery – a review

Cited by 2 publications

References 11 publications

Enhancing ectasia screening using advanced AS-OCT: a case series of challenging refractive candidates

Enhancing ectasia screening using advanced AS-OCT: a case series of challenging refractive candidates

Repeatability and Agreement of Anterion with Pentacam HR and Orbscan II in Corneal Parameters after Photorefractive Keratectomy

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