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Effect of microkeratome suction during LASIK on ocular structures
Alireza Mirshahi1, Thomas Kohnen
1Department of Ophthalmology, Johann Wolfgang Goethe-University, Frankfurt am Main, Germany.
Ophthalmology
|April 6, 2005
Summary
Microkeratome suction during LASIK surgery thins the lens and increases vitreous distance, potentially causing posterior vitreous detachment (PVD). Further research is needed to understand the link between LASIK and PVD.
Area of Science:
- Ophthalmology
- Refractive Surgery
- Ocular Biomechanics
Background:
- Laser-Assisted In Situ Keratomileusis (LASIK) is a common refractive surgery.
- Understanding intraoperative biomechanical effects is crucial for patient safety.
Purpose of the Study:
- To investigate the impact of microkeratome suction on ocular structures during LASIK.
- To assess changes in ocular dimensions and the occurrence of posterior vitreous detachment (PVD).
Main Methods:
- Prospective observational case series of 21 eyes undergoing LASIK.
- Preoperative and intraoperative A-scan and B-scan ultrasonography were used.
- Measurements included axial length, anterior chamber depth, lens thickness, and vitreous distance.
Main Results:
- Microkeratome suction led to a significant decrease in lens thickness (mean -0.20 mm) and an increase in vitreous distance (mean 0.20 mm).
- No significant changes were observed in axial length or anterior chamber depth.
- Post-LASIK, 21.4% of eyes developed new PVD, and 14.3% of pre-existing PVD enlarged.
Conclusions:
- Microkeratome suction during LASIK causes anterior traction on the posterior segment, indicated by lens thinning and increased vitreous distance.
- The observed PVD development and enlargement warrant further investigation into the relationship with LASIK procedures.