Enhancement Linked Laser Asymmetric Keratectomy Using semi-c
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Researchers aimed to introduce a new technique to reduce regional asymmetry of corneal thickness by assessing its effectiveness in 4 patients with myopic regression after laser refractive surgery (LRS).

Analysis included 4 patients (four eyes) with myopic regression after LRS in this study. A new technique of enhancement with laser epithelial keratomileusis-linked laser asymmetric keratectomy using semi-cylindrical ablation pattern (E-LAK-SCAP) with full integration of the Vision-Up software for analyzing the corneal thickness deviation can be used to create central symmetry by blocking laser ablation on the thin cornea.

It reduces the regional asymmetry of the corneal thickness, thus improving corneal symmetry and correcting the refractive power and myopic shift due to E-LAK-SCAP. Refraction, visual acuity, intraocular pressure (IOP), central corneal thickness (CCT), corneal irregularities in the 3.0mm, and 5.0 zones on Orbscan maps, the sum of corneal thickness deviations in four directions (SUM), distance between the maximum posterior elevation (best-fit-sphere [BFS]) and the visual axis (DISTANCE), and angle kappa before and after LRS and E-LAK-SCAP were measured. Blurring scores were measured before and after E-LAK-SCAP.

Results:
--The uncorrected far visual acuity (LogMAR) increased after LRS and E-LAK-SCAP.

--SUM increased after LRS in three cases, but decreased in all four cases after E-LAK-SCAP. DISTANCE increased after LRS, but decreased after E-LAK-SCAP.

--The spherical equivalent, CCT, decreased after LRS and E-LAK-SCAP. Blurring scores decreased after E-LAK-SCAP, and angle kappa was similar before and after LRS, but decreased after E-LAK-SCAP.

--IOP was similar before and after both LRS and E-LAK-SCAP.

Finally, E-LAK-SCAP enhanced corneal symmetry by lowering the Amount and DISTANCE, resulting in strong postoperative visual acuity and less blurring. In the one-year postoperative cycle, there was no myopic regression.

Source: https://www.dovepress.com/a-novel-approach-to-enhancement-linked-laser-asymmetric-keratectomy-us-peer-reviewed-fulltext-article-OPTH
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