Higher-order Aberrations and Visual Quality After Incision Lenticule Extraction Surgery with Intraoperative Angle Kappa Adjustments Between Small and Large Kappa Patients: A 2-year Follow-up

Overview

Journal Indian J Ophthalmol

Specialty Ophthalmology

Date 2023 May 19

PMID 37203043

Authors

Mengzhen Xie

Yingping Deng

Chengshu Sun

Lemei Qiu

Jing Tang

Affiliations

Soon will be listed here.

Abstract

Purpose: To evaluate the postoperative visual outcomes, that is, corneal higher-order aberrations (HOAs) and visual quality, of patients with an angle kappa greater than 0.30 mm who underwent angle kappa adjustment during small-incision lenticule extraction (SMILE) 2 years after surgery compared to eyes with an angle kappa less than 0.30 mm.

Methods: This was a retrospective study and included 12 patients from October 2019 to December 2019 who underwent the SMILE procedure for correction of myopia and myopic astigmatism and had one eye with a large kappa angle and another eye with a small kappa angle. Twenty-four months after surgery, an optical quality analysis system (OQAS II; Visiometrics, Terrassa, Spain) was used to measure the modulation transfer function cutoff frequency (MTF), Strehl2D ratio, and objective scatter index (OSI). HOAs were measured with a Tracey iTrace Visual Function Analyzer (Tracey version 6.1.0; Tracey Technologies, Houston, TX, USA). Assessment of subjective visual quality was achieved using the quality of vision (QOV) questionnaire.

Results: At 24 months postoperatively, the mean spherical equivalent (SE) refraction was - 0.32 ± 0.40 and - 0.31 ± 0.35 in the S-kappa group (kappa <0.3 mm) and the L-kappa group (kappa ≥0.3 mm), respectively (P > 0.05). The mean OSI was 0.73 ± 0.32 and 0.81 ± 0.47, respectively (P > 0.05). There was no significant difference in MTF and Strehl2D ratio between the two groups (P > 0.05). Total HOA, coma, spherical, trefoil, and secondary astigmatism were not significantly different (P > 0.05) between the two groups.

Conclusion: Adjustment of angle kappa during SMILE helps reduce the decentration, results in less HOAs, and promotes visual quality. It provides a reliable method to optimize the treatment concentration in SMILE.

Citing Articles

Comparison of objective visual quality between SMILE and FS-LASIK in moderate-to-high myopia.

Zou H, Wei X, Li L, Wei D, Mao H, Huang Y Front Med (Lausanne). 2024; 11:1408516.

PMID: 39359915 PMC: 11446171. DOI: 10.3389/fmed.2024.1408516.

Comparison of visual outcomes and optical aberrations after SMILE with intraoperative Kappa angle adjustments between small and large Kappa angles.

Lai X, Liu X, Zeng T, Huang Y, Yang X Sci Rep. 2024; 14(1):14551.

PMID: 38914606 PMC: 11196622. DOI: 10.1038/s41598-024-65366-w.

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