Management of Post lasik residual myopic astigmatism evaluation of two different techniques

Purpose: is to study and evaluate two different techniques which is femtosecond lasik and transepithelial photorefractive keratotomy in management of post lasik residual myopic astigmatism. In both ways we calculate the central corneal thickness, preoperative refractive errors SER, preoperative UDVA, CDVA, and postoperative six months UDVA. Methods: patients are divided into two groups each group is 40 eyes. Each group was evaluated and examined for CCT, Preoperative UDVA &CDVA, postoperative UDVA, pentacam, and all preoperative investigations. the Visumax femtosecond and MEL 90 excimer lasers were used for all FS- LASIK procedures and the MEL 90 excimer laser used for the two step trans epithelial PRK. The follow up period were six months for both groups. Results: in both groups twenty seven patients were operated for forty eyes. In group one the main SER was -1.98 ±0.47 D, the main UDVA was 0.34 ±0.13 Log MAR, the main preoperative CDVA was 0.01 ±0.03 Log MAR, the main preoperative CCT was 466.10 ±12.08 micron , the main postoperative CCT was 309.40 ±9.63 micron. In group two the main SER was -1.77 ±0.67 D, the main UDVA was 0.32 ± 0.11 Log MAR, the main preoperative CDVA was 0.00 ±0.01 Log MAR, the main preoperative CCT was 402.97 ± 20.15 micron, the main postoperative CCT was 379.27 ± 26.26 micron. Conclusion: both groups achieved high percentages of the postoperative target refraction with high safety and efficacy. Wavefront guided ablation improves the outcome of refraction and aberrations especially in TPRK.