Authors: Simon P. Holland, David T.C. Lin, Albert Covello, Samuel Arba Mosquera
Author Disclosure Block: S.P. Holland: Membership on advisory boards or speakers’ bureaus; Allergan. Membership on advisory boards or speakers’ bureaus; Description of relationship(s); Advisory Board Member. Funded grants or clinical trials; Alcon. Funded grants or clinical trials; Description of relationship(s); Clinical Trail Investigator. D.T. Lin: Any direct financial payments including receipt of honoraria; SCHWIND, ALLERGAN, SHIRE. Any direct financial payments including receipt of honoraria; Description of relationship(s); Speaker, travelling expense, Speaker, travelling expense, Speaker, travelling expense. A. Covello: Funded grants or clinical trials; Alcon. Funded grants or clinical trials; Description of relationship(s); Clinical Trail Sub-Investigator. S. Mosquera: All other investments or relationships that could be seen by a reasonable, well-informed participant as having the potential to influence the content of the educational activity; SCHWIND. All other investments or relationships that could be seen by a reasonable, well-informed participant as having the potential to influence the content of the educational activity; Description of relationship(s); Employee.

Abstract Body:

Purpose: To evaluate Topography-guided Photorefractive Keratectomy (TG-PRK) for Irregular astigmatism after Radial Keratotomy (RK) with Schwind Amaris 1050 (SA)
Study Design: Retrospective case series
Methods: Retrospective case series of 33 RK eyes treated with SA laser and CXL. Data collected at 12 months for analysis: pre- and post-operative UDVA, CDVA, MR and topographic cylinder.
Results: 19 of 33 (58%) showed UCVA ≥20/40 post-operatively. 17 (52%) had improved CDVA and 9(27%) gained ≥2 lines while 1 (3%) lost 2 or more line. Mean astigmatism was reduced from 2.07±1.79D to 0.98±1.17D. Mean spherical equivalent was improved from 2.46±1.95D to -0.42±1.79D.
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 (58%) had UDVA ≥20/40 at one year and 25% had CDVA improved ≥2 lines. The technique maybe an alternative treatment for post-RK with contact lens intolerance.