OBJECTIVE: To evaluate the correlation of flow and stopping time intraoperative loss of attachment factors as hypertension or hipocorreções of refractive errors after Lasik. METHODS: The age ranged between 19 and 61 years (mean= 31.27 ± 9.99). The minimum follow-up period was 90 days. Individuals with: corneal topography preoperative maximum keratometry greater than 46.5D or presence of irregularities, corneal curvature postoperative simulated smaller 36.0D, pupils more 6mm; corneal thickness smaller 500 µm; Myopia more -8.0, hyperopia more +5.0DE and astigmatism more -4.0DC. The laser was used with Esir Schwind Eye-Tracking and 350Hz scanning spot of 0.8 mm. The microkeratome used was the Moria M2 with programming 130µm thick. RESULTS: The visual acuity logMAR preoperative correction ranged from 0.40 to 0 (mean= 0.23 ± 0.69) and postoperative uncorrected 0.40-0 (x= 0.30 ± 0, 68). The Median= 0 logMAR for both time points (p= 0.424). For spherical equivalent before and after surgery, we found an obvious difference, with the pre (mean= -4.09 ± 2.83) and post (mean= -0.04 ± 0.38). The Median was -4.75 in the pre and zero postoperatively (p <0.0001). Sixty-nine cases (78.3%) were plan ± 0.25. Fluency minimum= 0.513 mJ/cm2 and maximum= 0.581 mJ/cm2 (mean= 0.545 ± 0.01), no correlation (r = -0.03266, 95% CI -0.241 to 0.178, p = 0.762) between the flow and spherical equivalent (mean = -0.04 ± 0.38) in eyes operated. The minimal downtime during surgery was 02 seconds and maximum was 12 seconds (mean= 4.90 ± 3.47). Making a correlation (r = 0.08865, 95% CI = -0.123 to 0.293, p = 0.411) between the postoperative spherical equivalent and downtime during surgery, not perceived differences. CONCLUSION: There was no correlation between the fluency of the laser during surgery and downtime due to loss of fixation with hipocorreções in hyper-or post-Lasik ametropia.
Keratomileusis, laser in situ; Refractive erros; Visual acuity
