Laser in situ keratomileusis retreatment for regression using a scanning-spot excimer laser system

AIM: To evaluate the effectiveness and safety of laser in situ keratomileusis for residual myopia and astigmatism using a scanning spot laser. METHODS: Ninety three myopia eyes (from 75 patients) underwent secondary LASIK at (7.18±3.56) months after primary LASIK procedure and following up was over 6 months. The statistical analysis of the data was made by the paired test. RESULTS: After the reteatment, the average uncorrected visual acuity (UCVA) improved significantly ( P 0.01) but compared with the best corrected visual acuity (BCVA) after primary LASIK, the UCVA after secondary LASIK had no significant difference ( P 0.05). At 6 months, the residual refractive error within ±0.5D were 96.8% (90 eyes). Compared with the preoperative BCVA, 21.5% (20 eyes) had better postoperative UCVA and no severe complications were observed. CONCLUSION: Secondary LASIK, using a scanning spot excimer laser system, is an effective and safe method to treat regression after primary LASIK.