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Efficacy and predictability of laser in situ keratomileusis (LASIK) for low astigmatism ≤ 0.75 diopter

Poster Details

First Author: A.Frings GERMANY

Co Author(s):    T. Katz   G. Richard   V. Druchkiv   S. Linke     

Abstract Details


To examine the refractive and visual outcome of wavefront-optimized laser in situ keratomileusis (LASIK) in myopic eyes with low astigmatism ? 0.75 diopter (D).


: University Medical Center Hamburg-Eppendorf, Germany and Care Vision Refractive Centers, Germany and Austria.


This study comprised 448 eyes of 448 consecutive myopic patients (145 male, 303 female; mean age at surgery 37.8±9.4 years) with preoperative refractive cylinder ? 0.75 D and with preoperative subjective sphere between -2.75 D and -11.50 D. Three subgroups were formed with respect to preoperative refractive cylinder magnitude (0.25, 0.50, and 0.75 D). Manifest refraction, uncorrected and corrected visual acuity were assessed pre- and postoperatively. The astigmatic changes achieved were determined by using the Alpins vector analysis.


By 4 months (116.8 ±27.7 days) follow-up, we obtained a mean uncorrected distant visual acuity (UDVA) of 0.10±0.13 logMAR and a mean manifest refraction spherical equivalent (MRSE) of -0.05 ±0.68 D. There was no statistically significant difference regarding efficacy and safety between the preoperative cylinder groups. Astigmatic overcorrection for preoperative cylinder of 0.25 D and 0.50 D was suggested by the correction index, the magnitude of error, the index of success, and the flattening index.


Although mean UDVA and mean MRSE obtained by a 4 month follow-up are appropriate, preoperative cylinder ? 0.50 D was significantly overcorrected. Accordingly, we are cautious in recommending full astigmatic correction for a manifest cylinder ? 0.50 D.

Financial Disclosure:

... travel has been funded, fully or partially, by a competing company

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