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First Author: R.Davidson USA
Co Author(s): M. Taravella J. Engle
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To compare the results of arcuate incisions made using the LenSx femtosecond laser at the time of cataract surgery utilizing two different nomogram values.
University of Colorado Eye Center, Denver, Colorado, USA
Arcuate incisions were performed using the LenSx femtosecond laser on 31 eyes of 22 patients for the correction of astigmatism at the time of cataract surgery. For 18 eyes a 66% value of the standard Donnenfeld nomogram was utilized. For 13 eyes an 85% value of the standard Donnenfeld nomogram was utilized. In addition, the LenSx laser was used to create the anterior capsulotomy, lens fragmentation, and the creation of temporal clear corneal and parecentesis incisions.
In the 66% nomogram group, the mean reduction of astigmatism was 22.6% and the mean spherical equivalent was +0.03D at 3 months post-operatively. 77.8% of patients had an uncorrected visual acuity of 20/25 at 3 months post-op. In the 85% nomogram group, the mean reduction of astigmatism was 78.4% and the mean spherical equivalent was +0.01D at 3 months post-operatively. In this group, 87.4% of patients had an uncorrected visual acuity of 20/25 at 3 months post-operatively (p<0.05).
The use of the 85% value of the standard Donnenfeld nomogram resulted in better reduction in astigmatism and better uncorrected post-operative visual acuity as compared to the 66% nomogram group. Further studies are underway evaluating the use of the full Donnenfeld nomogram to see if even better results are possible.