Purpose:

To evaluate Topography-guided Photorefractive Keratectomy (TG-PRK) for Irregular astigmatism after Radial Keratotomy (RK) with Schwind Amaris 1050 (SA)

Methods:

Retrospective case series of 46 RK eyes treated with Schwind Amaris 1050 excimer laser with CXL with Athens protocol. Preoperative and post-operative uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), manifest refraction (MR) and topographic cylinder were analyzed after 12 months of follow-up.

Results:

23 of 46 (51%) showed UCVA ≥20/40 post-operatively. 18 (39%) had improved CDVA and 5 (11%) gained ≥2 lines while 1 (2%) lost 2 or more line. Mean astigmatism was reduced from 2.51±1.94D to 1.11±0.96D. Mean spherical equivalent was improved from 1.97±1.95D to -0.77±2.08D.

Conclusions:

Early results of TG-PRK CXL with Schwind Amaris 1050 show efficacy and safety in treating post-RK irregular astigmatism. More than a half (51%) had UDVA ≥20/40 at one year and 39% had CDVA improved. The technique maybe an alternative treatment for post-RK with contact lens intolerance.