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BMC Ophthalmology
Published in: BMC Ophthalmology 1/2016

Open Access 01-12-2016 | Research article

Corneal biomechanical changes in eyes with small incision lenticule extraction and laser assisted in situ keratomileusis

Authors: Ihab Mohamed Osman, Hany Ahmed Helaly, Moones Abdalla, Mohsen Abou Shousha

Published in: BMC Ophthalmology | Issue 1/2016

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Abstract

Background

Evaluating the corneal biomechanical changes using the Ocular Response Analyzer and the Corvis ST in eyes with incision lenticule extraction (SMILE) and laser assisted in situ keratomileusis (LASIK).

Methods

This is a retrospective study that included 50 eyes equally divided into two groups. The first group included eyes that underwent SMILE procedure using VisuMax® 500 kHz laser system (Carl Zeiss Meditec, Jena, Germany) and the second group included eyes that underwent LASIK procedure using the EX500 Allegretto excimer laser platform (Wavelight GmbH, Erlangen, Germany). The Ocular Response Analyzer (ORA) and the Corvis ST (CST) measured the corneal biomechanical changes before and after the procedures.

Results

The ORA showed significant decrease of corneal hysteresis (CH) and corneal resistance factor (CRF) in both groups postoperatively. The percentage of change of CH and CRF were found to be significantly higher in group II. There was no significant difference in the IOP with the ORA and the CST pre and postoperatively in either group. Using CST, the deformation amplitude and HC peak distances increased significantly in both groups. It was also noted that the mean percentage of change of the deformation amplitude was nearly five times higher in group II than group I.

Conclusion

Both LASIK and SMILE substantially decreased the corneal biomechanical properties with greater reduction in the LASIK group.
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Metadata
Title
Corneal biomechanical changes in eyes with small incision lenticule extraction and laser assisted in situ keratomileusis
Authors
Ihab Mohamed Osman
Hany Ahmed Helaly
Moones Abdalla
Mohsen Abou Shousha
Publication date
01-12-2016
Publisher
BioMed Central
Published in
BMC Ophthalmology / Issue 1/2016
Electronic ISSN: 1471-2415
DOI
https://doi.org/10.1186/s12886-016-0304-3

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