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ORIGINAL ARTICLE
Year : 2019  |  Volume : 32  |  Issue : 2  |  Page : 665-671

Comparing the corneal biomechanical stability after small incision lenticule extraction and laser-assisted in situ keratomileusis for myopic correction using an ultra-high-speed camera (Corvis ST)


1 Department of Ophthalmology, Faculty of Medicine, Menoufia University, Shebeen El-Kom, Egypt
2 Department of Ophthalmology, Ministry of Health, Damietta, Egypt

Correspondence Address:
Hossam F El-Barbry
3-Elmaahad Elazhari Street, Damietta
Egypt
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/mmj.mmj_761_17

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Objectives The aim of this study was to invest igate the differences in corneal deformation parameters after femtosecond laser small incision lenticule extraction (SMILE) and laser-assisted in situ keratomileusis (LASIK). Background Applanation time and deformation amplitude [as measured with the CorVis ST (CST)] may be useful in assessing corneal biomechanical changes after corneal refractive surgery. The aim of this study was to evaluate the corneal biomechanical changes using the CST in eyes with LASIK and SMILE. Participants and methods This is a small prospective clinical interventional series study carried out from March 2016 to April 2017 on 50 eyes divided equally into two groups. The first group included eyes that were subjected to the LASIK procedure using the EX500 Allegretto excimer laser platform and the second group included eyes that were subjected to the SMILE procedure using the VisuMax 500 kHz laser system; the CST measured the corneal biomechanical changes before and after the procedures. Results Using CST, the deformation amplitude increased significantly in both groups. It was also noted that the mean percentage of change of the deformation amplitude was nearly two times higher in group I (0.13 ± 0.03) than group II (0.07 ± 0.01) (P < 0.001). First applanation time showed a significant decrease from preoperative to postoperative values in both groups (P < 0.001). Also, the highest concavity time, radius, and peak distance showed a significant decrease from preoperative to postoperative values in both groups. Conclusion Both LASIK and SMILE considerably decreased the corneal biomechanical properties, with greater reduction in the LASIK group.


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