Changes in Posterior Cornea and Posterior-To-Anterior Curvature Radii Ratio 1 Year After LASIK, PRK, and SMILE Treatment of Myopia.

Autor:	Moshirfar M; Hoopes Vision Research Center, Hoopes Vision, Draper, UT.; John A. Moran Eye Center, University of Utah School of Medicine, Salt Lake City, UT.; Utah Lions Eye Bank, Murray, UT., Cha DS; Saint Louis University School of Medicine, Saint Louis, MO., Santos JM; University of Arizona College of Medicine Phoenix, Phoenix, AZ; and., Herron MS; University of Nevada, Reno School of Medicine, Reno, NV., Hoopes PC; Hoopes Vision Research Center, Hoopes Vision, Draper, UT.
Jazyk:	angličtina
Zdroj:	Cornea [Cornea] 2024 Aug 01; Vol. 43 (8), pp. 950-954. Date of Electronic Publication: 2024 Apr 02.
DOI:	10.1097/ICO.0000000000003530
Abstrakt:	Purpose: The purpose of this study was to compare changes in the posterior curvature and the posterior-anterior radii ratio of the cornea, 1 year postoperatively in laser in situ keratomileusis (LASIK), photorefractive keratectomy (PRK), and small incision lenticule extraction (SMILE). Methods: This retrospective study was performed at a single surgical center. 199 eyes were included in the study from 119 patients with manifest refraction spherical equivalents from -7.61 to -2.54 D. 67 eyes underwent LASIK, 89 underwent PRK, and 43 underwent SMILE. Both preoperative and 1-year postoperative front and back sagittal keratometry were measured at 4- to 6-mm zones around the corneal vertex. Corneal asphericity (Q-value) was measured at an 8-mm zone around the corneal vertex. Results: The average change in the posterior-anterior radii ratio after LASIK, PRK, and SMILE did not differ between surgery groups at 4 mm (LASIK: -0.075, PRK: -0.073, SMILE: -0.072, P = 0.720), 5 mm (LASIK: -0.072, PRK: -0.068, SMILE: -0.068, P = 0.531), or 6 mm (LASIK: -0.075, PRK: -0.071, SMILE: -0.072, P = 0.456) zones. Anterior Q-value significantly positively increased after all 3 surgeries ( P < 0.001). The posterior Q-value also significantly positively increased after LASIK ( P < 0.001) and SMILE ( P < 0.001), but not after PRK ( P = 0.227). Both anterior and posterior keratometric power decreased significantly after LASIK, PRK, and SMILE for all diameters. Conclusions: The change in the posterior-anterior radii ratio was not influenced by the type of refractive surgery performed, as indicated by statistically identical preoperative, postoperative, and delta values. In addition, the posterior cornea exhibited paracentral flattening after LASIK, SMILE, and PRK and increased oblateness after LASIK and SMILE. Competing Interests: The authors have no funding or conflicts of interest to disclose. (Copyright © 2024 Wolters Kluwer Health, Inc. All rights reserved.)
Databáze:	MEDLINE
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