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J.H. Lee, R.W. Snyder, J. Schweigerling, C. Nedrud, M. Chang; Longitudinal Spherical Aberration after LASEK and LASIK . Invest. Ophthalmol. Vis. Sci. 2003;44(13):2644.
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Purpose: LASEK has been gaining popularity as a viable alternative to LASIK because it doesn't require a permanent stromal flap and has had encouraging visual aquity outcomes. Recently, longitudinal spherical aberration has been postulated to be responsible for some of the postoperative visual disturbances after refractive surgery. In this study, we evaluated the amount of longitudinal spherical aberration of LASEK patients pre and post-operatively and compared them with wavefront data from LASIK patients. Methods: All patients underwent a thorough preoperative screening for refractive surgery. Thirteen eyes from LASEK and thirty-five eyes from LASIK were compared. All procedures were for correction of myopic astigmatism and were performed using the VISX S3 excimer laser system and AMADEUS or Moria LSK microkeratome. A Shack-Hartmann wavefront aberrometer was used to obtain wavefront data on all patients preoperatively and at least 3 months postoperatively. Values from the Zernike term #12 at 6-millimeter pupil diameter were used for the calculation of longitudinal spherical aberration. Statistical analysis was carried out on all data to determine any statistical significance. Results: The levels of preoperative and postoperative longitudinal spherical aberration were calculated with a Shack-Hartmann wavefront sensor for LASIK and LASEK eyes. The mean value for the preoperative longitudinal spherical aberration for LASEK was 0.175 microns +/- 0.112 microns. The postoperative longitudinal spherical aberration for LASEK was 0.257 microns +/- 0.126 microns. The postoperative longitudinal spherical aberration for LASIK was 0.330 microns +/- 0.140 microns. Conclusions: The data trend suggests that postoperative longitudinal spherical aberration is greater for LASIK than for LASEK when correcting myopic astigmatism.
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