RESEARCH ARTICLE


Clinical Outcomes of Laser Asymmetric Keratectomy to Manage Postoperative Adverse Effects–A Retrospective Clinical Trial



Ji Sang Min1, Byung Moo Min2, *
1 Kim’s Eye Hospital, Division of Cornea, Cataract, and Refractive Surgery; Konyang University School of Medicine, Youngdeungpo-gu, Seoul, 07301, Republic of Korea
2 Woori Eye Clinic, Affiliated with the Department of Ophthalmology, Yonsei University School of Medicine, Seo-Ku Daejon, 35229, Republic of Korea


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Creative Commons License
© 2021 Min and Min.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: (https://creativecommons.org/licenses/by/4.0/legalcode). This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at Woori Eye Clinic, Affiliated with the, Department of Ophthalmology, Yonsei University School of Medicine;, 219 DaedukDae-Ro (Dunsan dong) Seo-Ku Daejon, 35229, Republic of Korea, Korea; Tel: 82-42- 476-1675; Fax: 82-42-476-1670; E-mail: bmin8275@naver.com


Abstract

Background:

Laser asymmetric keratectomy reduces the regional asymmetry of corneal thickness.

Objective:

We aimed to describe the clinical outcomes of laser asymmetric keratectomy keratectomy with laser refractive surgery performed to resolve the adverse effects following ophthalmic surgeries.

Methods:

We compared the preoperative and postoperative outcomes and complaints of blurring after performing laser asymmetric keratectomy with laser refractive surgery in 24 eyes of 16 patients with a deviation sum in corneal thickness in four directions >80 µm. Laser asymmetric keratectomy with laser refractive surgery, with full integration of the Vision Up software, was used to analyze the corneal thickness deviation, employed selective laser ablation to create central symmetry on the thicker cornea to reduce regional asymmetry of corneal thickness, simultaneously correcting the refractive power and myopic shift. The pre-and postoperative clinical and topographic findings were analyzed.

Results:

The patients’ age was 37.57±22.30 (range, 23–65) years. The follow-up period was 16.56±3.23 months. The spherical equivalent (p=0.026), sphere (p=0.022), uncorrected distance visual acuity (LogMAR, p=0.045), blurring score (p=0.000), central corneal thickness (p=0.024), sum of deviations in corneal thickness in four directions (p=0.02), distance between the maximum posterior elevation and visual axis (p=0.04), and kappa angle (p=0.031), significantly decreased postoperatively. The efficiency and safety indices were 0.96±0.11 and 1.00, respectively. There was no myopic regression or blurred vision postoperatively.

Conclusion:

Performing laser asymmetric keratectomy with laser refractive surgery improved corneal symmetry and visual acuity and reduced blurring.

Keywords: Corneal asymmetry, Laser keratectomy, Laser refractive surgery, Surgical outcomes, Uncorrected visual acuity, Visual acuity.