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Comparison of central topographic maps from a swept-source OCT biometer and a Placido-dual-Scheimpflug tomographer.

Authors:
Li Wang Ana Laura C Canedo Yvonne Wang Kate C Xie Douglas D Koch

J Cataract Refract Surg 2020 Oct 16. Epub 2020 Oct 16.

From the Cullen Eye Institute, Department of Ophthalmology, Baylor College of Medicine, Houston, Texas. Supported in part by Sid W. Richardson Foundation, Fort Worth, Texas, and an unrestricted grant from Research to Prevent Blindness, New York, New York.

Purpose: To compare central topography (CT) from IOLMaster 700 to predicate topographic maps (PT) from a Placido-dual-Scheimpflug tomographer in detection of irregularities that would influence the decision-making for implanting premium intraocular lenses (IOLs) (toric, multifocal, or extended depth-of-focus).

Swetting: Cullen Eye Institute, Baylor College of Medicine, Houston, Texas.

Design: Prospective comparative case series.

Methods: Eyes with various corneal conditions were randomly selected: regular/irregular corneas, previous corneal refractive surgery, and keratoconus or pellucid marginal degeneration. Three observers compared the CT and PT maps and answered a questionnaire for each eye. The questionnaire focused on (1) overall shape similarity between CT and PT and ( 2) decision-making for premium IOL implantation based on CT and PT. Answers to the questionnaire and agreement in answers among observers were evaluated.

Results: The study included 105 eyes. Comparing CT and PT, similar shape was observed in 68.6% to 89.5% of cases, and comparable map symmetries were reported in 60.0% to 83.8%; the same decision was made in 75.2% to 97.1% of cases for premium IOL implantation. There were significant inter-observer agreements among 3 observers for all questions, with Fleiss kappa values ranging from 0.141 to 0.450 (all P<0.05). Peripheral corneal steeping or flattening was the primary finding that was visible on PT, but not on CT.

Conclusion: Compared to the PT, CT provided similar overall shape and comparable symmetries in the majority of cases. The same decision was made whether to recommend a premium IOL based on CT and PT in 75 to 97% of cases.

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http://dx.doi.org/10.1097/j.jcrs.0000000000000459DOI Listing
October 2020

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