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Comparisons of morphologic characteristics between thin-flap LASIK and SBK
Yi Sun1, Ying-Ping Deng, Lin Wang
1Department of Ophthalmology, West Hospital of China, Chengdu 610041, Sichuan Province, China.
International Journal of Ophthalmology
|July 10, 2012
Summary
Sub-Bowman keratomileusis (SBK) creates more uniform corneal flaps than laser in situ keratomileusis (LASIK). Flap thickness was not significantly correlated with central corneal thickness or corneal curvature in either procedure.
Area of Science:
- Ophthalmology
- Refractive Surgery
- Corneal Surgery
Background:
- Laser in situ keratomileusis (LASIK) and Sub-Bowman keratomileusis (SBK) are common refractive surgery procedures.
- Understanding corneal flap characteristics is crucial for surgical outcomes.
Purpose of the Study:
- To compare the morphologic characteristics and uniformity of corneal flaps created by SBK and LASIK.
- To investigate factors influencing corneal flap thickness in these procedures.
Main Methods:
- A prospective, randomized, comparative study involving 59 patients (114 eyes) undergoing either SBK or LASIK for myopia correction.
- Anterior optical coherence tomography (OCT) was used to measure corneal flap thickness at 16 positions per eye, one week post-surgery.
Main Results:
- The SBK group exhibited significantly greater corneal flap uniformity (lower coefficient of variation) compared to the LASIK group (P=0.000).
- While intra-group flap thickness variations were not significant, inter-group differences in superior-inferior positions were statistically significant (P=0.036).
- No significant correlation was found between flap thickness and central corneal thickness (P=0.060) or corneal curvature (P=0.083).
Conclusions:
- SBK demonstrates superior performance in creating uniform corneal flaps compared to LASIK.
- Corneal flap thickness in these procedures is not significantly influenced by central corneal thickness or corneal curvature.
