Surgically-induced astigmatism after laser in sitn keratomileusis for spherical myopia

PURPOSE: To characterize the surgically-induced-astigmatism (SIA) associate d with spherical LASIK. METHODS: Refractive outcomes in 70 eyes that underwent primary myopic LASIK with purely spherical ablation were analyzed. The Summit Apex Plus excimer laser was used. The Bausch & Lomb Hansatome with the 180-mu m plate was us ed to produce superiorly hinged flaps. The relationship between refractive astigmatism and corneal topographic astigmatism was analyzed using linear r egression and vector analysis. RESULTS: There was a statistically significant negative correlation (slope = -0.21) between refractive surgically-induced astigmatism and preoperative topographic cylinder. A 0.24-D with-the-rule shift was also found. Surgica lly-induced astigmatism was not correlated with the magnitude of laser abla tion. CONCLUSION: The lamellar keratotomy portion of LASIK reduces pre-existing c orneal astigmatism and produces a relative steepening of the hinge meridian .