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First Author: M.Bohac CROATIA
Co Author(s): A. Biscevic M. Koncarevic M. Anticic N. Gabric
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To compare the outcomes of two flying spot lasers and their aspheric ablation profiles for treating astigmatism in virgin corneas.
Specialty Eye Hospital Svjetlost, Zagreb, Croatia
Prospective consecutive observational partially randomized case series on 418 eyes, myopic and mixed astigmatism between 2 and 7 diopters (D). Groups were further divided according to the laser platform used. There was no significant difference between the subgroups preoperatively in relation to cylinder power, sphere, uncorrected distance visual acuity (UDVA) and corrected distance visual acuity (CDVA). For statistical analysis z test and Pearson correlation were used. One year postoperative data are presented.
There was no significant difference in postoperative UDVA between laser platforms (p=1.00, p=0.151). No eyes lost any line of CDVA. No complications were observed. There was no significant difference in effectiveness of spherical correction between subgroups (p>0.05). Mean(ḟSD) residual cylinder was 0.43ḟ0.36D and -0.53ḟ0.46D, myopic group and 0.58ḟ0.38DD and -0.85ḟ0.41D, mixed astigmatism the difference was significant (p<0.05). For the Schwind Amaris 750S there was a tendency toward undercorrection in both the myopic and mixed astigmatism when comparing the attempted cylindrical correction with the postoperative cylinder (r=0.4701, p<0.01, n =119 and r=0.3257, p<0.01, n=111). The same tendency was observed in the Wavelight Allegretto IQ (r=0.3978, p<0.01, n =127 and r=0.4567, p<0.01, n=61). Mean spherical aberration shifted from positive to negative in mixed astigmatism for both lasers (p<0.05). No other significant changes in higher order aberrations were observed (5mm pupil)
Both lasers tend to undercorrect astigmatism. However, the results were well tolerated and safe.