Influence of Preoperative Astigmatism Type and Magnitude on the Effectiveness of SMILE Correction



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Pérez Izquierdo, Ricardo and Rodríguez Vallejo, Manuel and Matamoros, Alicia and Martínez, Javier and Garzón Jiménez, Nuria and Poyales Galán, Francisco and Fernández, Joaquín (2019) Influence of Preoperative Astigmatism Type and Magnitude on the Effectiveness of SMILE Correction. Journal of Refractive Surgery . ISSN 1081-597X (In Press)

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PURPOSE: To assess the effectiveness of small incision lenticule extraction (SMILE) as a function of the astigmatism level and type.
METHODS: A total of 102 right eyes were included in this study. Refractive astigmatism and corneal astigmatism measured with Scheimpflug technology were retrieved from the preoperative visit and the 3-month follow-up visit. Patients were split into three groups according to the preoperative refractive astigmatism (0.50, 0.75 to 1.25, and 1.50 diopters [D] or greater) and the effectiveness among each group was evaluated according to the with-the-rule (WTR), against-the-rule (ATR), and oblique classifications. The standard Alpins method was used for the analysis.
RESULTS: Resultant astigmatism was not associated with its preoperative classification when the total sample was considered, but a significant association emerged between the presence of resultant astigmatism and its preoperative classification in the 1.50 D or greater group. The magnitude of error was significantly lower in the WTR (median: -0.30 D) than in the oblique and ATR astigmatism groups, resulting in a coefficient of adjustment of 1.13 for WTR astigmatism of 1.50 D or greater but not for the other types.
CONCLUSIONS: Astigmatism correction with SMILE is predictable for astigmatism lower than 1.50 D without the need to apply a correction. However, higher undercorrection is present in WTR astigmatism of 1.50 D or greater.

Item Type:Article
Additional Information:

Submitted: April 18, 2018; Accepted: November 26, 2018

Uncontrolled Keywords:Astigmatism; SMILE correction, Preoperative astigmatism, astigmatism correction
Subjects:Medical sciences > Medicine > Surgery
Medical sciences > Medicine > Ophtalmology
Medical sciences > Optics > Optometry
Medical sciences > Optics > Eyes anatomy
ID Code:50582
Deposited On:11 Jan 2019 09:47
Last Modified:26 Nov 2019 00:01

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