Abstract
The three-dimensional (3D) finite element model of human eye was established, and the intraocular pressure (IOP) was loaded to simulate refractive surgery. The biomechanical properties of human cornea after SMILE and LASIK surgery were studied from the stress, strain and induced wavefront aberration. Our results showed that SMILE had less impact on the biomechanics, having less stress and strain changes than LASIK. However, the stress and strain of the cornea increased with the increase of the diopter and were concentrated in the central region. We also investigated the changes in wavefront aberrations of the cornea after surgery, and the results indicated that the defocus and vertical commotion were significantly affected by SMILE and LASIK surgery, while the remaining aberrations were approximately unchanged. In conclusion, both SMILE and LASIK sergury procedures changed the postoperative corneal biomechanics, but SMILE had less impact on the biomechanics of corneal.
Highlights
The rate of myopia is on the rise in China, which has become a prominent public health problem[1]
The main difference between SMILE surgery and LASIK refractive surgery is that SMILE surgery only requires a small incision to remove the corneal lenticule to complete the SMILE surgery[2]
We studied the biomechanical changes of cornea after SMILE and LASIK refractive surgery by finite element analysis
Summary
The rate of myopia is on the rise in China, which has become a prominent public health problem[1]. There are a growing number of treatments for myopia, including corneal refractive surgery, which allows myopic patients to remove their glasses. The main difference between SMILE surgery and LASIK refractive surgery is that SMILE surgery only requires a small incision to remove the corneal lenticule to complete the SMILE surgery[2]. The biomechanical properties of cornea have important reference significance, especially for the visual quality after refractive surgery. Osman et al [6] thought that LASIK and SMILE substantially decreased the corneal biomechanical properties, and the LASIK group had greater reduction. The cornea is the main refractive functional tissue of the eyeball[7], and it is important to maintain the completeness of corneal biomechanics[8]
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