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Impressum
Wavefront-Guided Laser in situ Keratomileusis (Lasik) based on the Hartmann-Shack-Aberroscopy-Principal to correct Myopia and Myopic Astigmatism
Kohnen T., Steinkamp G. W. K., Bühren J., Gerhardt D., Cichocki M., Mirshahi A.
Universitäts-Augenklinik, Theodor-Stern-Kai 7, D-60590 Frankfurt
The purpose of this study was to evaluate wavefront-guided laser in situ
keratomileusis (LASIK) for myopia and myopic astigmatism.
Patients and methods: Sixty-seven consecutive LASIK procedures
(patients age ranged from 22 to 53 years) were evaluated. The microkeratome
Hansatome with a superior hinge and the scanning-spot excimer laser Keracor
217z were used. Laser ablation was based on an aberrometer (Zywave) and
a connecting software (Zylink). The mean preoperative spherical equivalent
was -5.51 D ± 2.29 (-1.0 to -10.88 D), the mean sphere -5.05 D,
the mean astigmatism -0.92 D. Ophthalmological examinations were performed
preoperatively, after 1 and 7 days and after 1 and 3 months. Safety, predictability,
efficacy and stability of the refractive results were evaluated using
the Datagraph software program (version 2.5).
Results: After 1 month 3% of the cases still lost 2 lines of best-corrected
visual acuity (BCVA), in 32% 1 line of BCVA were gained. More than 92%
of the treated eyes were postoperatively in the range of ± 1.0
D. The uncorrected visual acuity 1 months postoperatively were in 87%
of the eyes = 0.5 (20/40). A good stability of the refractive results
were found between 1 week and 1 month. Induced glare was not reported
by any of the patients.
Conclusions: Wavefront-guided LASIK improves the results with excimer
based corneal refractive surgery for myopia and myopic astigmatism.