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R.H. Roe, J. Kanellopoulos, A. Papakostas, L. Pe, L. Sperber, M. Jankov; A Prospective Evaluation of Asphericity Adjusted LASIK With the Allegretto–Wave and the M2 in 645 Eyes . Invest. Ophthalmol. Vis. Sci. 2006;47(13):3604.
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© ARVO (1962-2015); The Authors (2016-present)
To evaluate the safety and efficacy of asphericity–adjusted LASIK surgery, utilizing the Allegretto–Wave 400 Hz system and the M2 microkeratome.
655 consecutive LASIK cases for myopic astigmatism underwent treatment with asphericity adjustment to the pre–op flattest keratometry (Q value: 0.15 to –0.46), based on 20 degrees topographic measurement. We evaluated pre– and post–operative refraction, asphericity (Q value), total high order aberrations (RMSH), contrast sensitivity and possible complications. Follow–up was 3–17 months (mean 8.5)
650 eyes were included. The mean values were: refractive error: sphere: –3.80D (–0.50 to –6.75) and cylinder: –0.85D (0.00 to –3.75). UCVA improved from 20/200 to 20/18. At 3 months 92% of the eyes were 20/20, 57% 20/15 and 34% 20/10. 100% of eyes were within +/– 0.5D of the refractive goal at 3 months. There was no loss of BSCVA in any case. The Q value changed from a mean of –0.29 to –0.11. There was a positive shift of Q value proportionate to the amount of refractive error corrected. The mean RMSH decreased from 0.25 to 0.10. Contrast sensitivity showed no statistically significant change.
Asphericity adjusted LASIK with the ALLEGRETTO–WAVE system (a 0.9mm flying–spot and 400Hz) and the M2 appears to be safe and very effective for correction of myopic astigmatism. It has demonstrated, in this limited clinical study, the ability to reduce higher order aberrations following LASIK, possibly through limiting the change in Q value.
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