RT Journal
A1 Chan CK, Boxer Wachler BS
T1 A comparison of customcornea myopia algorithms for wavefront-guided laser in situ keratomileusis
JF Archives of Ophthalmology
JO Archives of Ophthalmology
YR 2008
FD August 11
VO 126
IS 8
SP 1067
OP 1070
DO 10.1001/archopht.126.8.1067
UL http://dx.doi.org/10.1001/archopht.126.8.1067
AB Objective 
    To determine whether the new CustomCornea M3 (myopic astigmatism) algorithm places additional pulses in the periphery to counter excimer laser peripheral ablation inefficiency.Methods 
    Analysis of 25 myopic eyes of 18 patients that were within the approved indications for both the myopic astigmatism (M3) and myopic sphere (A7) algorithms. We analyzed ablation depth at peak and 4-mm, 6-mm, and 7-mm zone diameters for both the A7 and M3 algorithms.Results 
    The M3 algorithm programmed for more of an ablation at the peak and peripheral zones than the A7 algorithm (P < .001). Even accounting for the additional peak ablation, there was significantly greater ablation in the periphery with the M3 algorithm compared with the A7 algorithm (P < .001). The mean (SD) manifest sphere was −4.09 (1.90) diopters (D), the mean (SD) manifest cylinder was −0.60 (0.52) D, and the mean (SD) manifest spherical equivalent was −4.39 (1.92) D. The manifest sphere ranged from −1.00 to −7.50 D, the manifest cylinder from 0.00 to −1.25 D, and the manifest spherical equivalent from −1.50 to −8.25 D.Conclusion 
    The new CustomCornea M3 algorithm is programmed to perform additional ablation in the periphery to counter decreased pulse efficacy and the potential for induced spherical aberration.