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Corneal stromal thickness changes after myopic laser corneal refractive surgery
Jorge L Alió Del Barrio1, Mario Canto-Cerdan, Mohamed El Bahrawy
1From the Cornea, Cataract and Refractive Surgery Unit, Vissum Alicante, Spain (Alió del Barrio, Canto-Cerdan, El Bahrawy, Casanova, García, Alió), the Division of Ophthalmology, School of Medicine, Universidad Miguel Hernández, Alicante, Spain (Alió del Barrio, Alió), the Watany Research & Development Center, Cairo, Egypt (El Bahrawy), and the Department of Structures, Construction and Graphical Expression, Technical University of Cartagena, Spain (Cavas).
The Amaris 750 excimer laser accurately predicted stromal changes after LASIK surgery, while the VisuMax FS laser for SMILE showed less accuracy. LASIK eyes experienced mild stromal rethickening post-surgery, unlike SMILE eyes.
Area of Science:
- Ophthalmology
- Refractive Surgery
- Corneal Biomechanics
Background:
- Femto-laser-assisted in-situ keratomileusis (LASIK) and small-incision lenticule extraction (SMILE) are common refractive surgeries.
- Understanding postoperative corneal stromal thickness behavior is crucial for refractive surgery outcomes.
Purpose of the Study:
- To evaluate central corneal stromal thickness (ST) after myopic LASIK and SMILE.
- To compare the accuracy of femtosecond laser (FS) and excimer laser machines in predicting stromal changes.
Main Methods:
- A prospective, observational, comparative study involving 77 LASIK eyes and 77 SMILE eyes.
- Corneal aberrometry and ST were measured using combined anterior segment optical coherence tomography and Placido disk topography.
- Laser-predicted stromal consumption was recorded and compared with actual stromal changes over 6 months.
Main Results:
- LASIK eyes showed significant central ST rethickening between months 1 and 3 (+4.38 μm), stabilizing thereafter.
- SMILE eyes demonstrated stable ST from month 1 postoperatively.
- The Amaris 750 excimer laser (LASIK) had a prediction error of +0.92 ± 8.16 μm, while the VisuMax FS laser (SMILE) had an error of -13.21 ± 7.00 μm.
Conclusions:
- The Amaris 750 excimer laser demonstrated superior accuracy in predicting stromal consumption for LASIK compared to the VisuMax FS laser for SMILE.
- Post-LASIK eyes exhibited mild stromal rethickening, whereas SMILE eyes maintained stable stromal thickness post-surgery.
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