Purpose: To evaluate the two-year results of the use of femto-assissted Keraring for management of keratoconus.
Design: A retrospective non-randomized clinical study.
Methods: 51 eyes of 31 patients with keratoconus were included in this study.
All eyes were subjected to preoperative and postoperative UCVA, BCVA, manifest refraction, slit lamp examination of anterior segment, IOP, fundus examination, keratometry and pachymetry assessed by Pentacam corneal topographies at 1, 3, 6, 12, 24 months follow up period.
Results: The preoperative mean UCVA was 1.22 ± 0.40 (logMAR ± SD) while the postoperative mean UCVA was 0.90 ± 0.18. The preoperative mean BCVA was 0.82 ± 0.30 while the postoperative mean BCVA was 0.52 ± 0.22. The preoperative K average was 49.77 ± 0.28 (D ± SD) while the postoperative K average was 46.89 ± 0.34. The preoperative mean central corneal thickness at the thinnest location was 457 ± 83.53 (µm ± SD) while the postoperative mean central corneal thickness was 432 ± 43.17. The preoperative mean astigmatism was 4.11 ± 0.57 (D ± SD). While the postoperative mean astigmatism was 0.88 ± 0.37. The mean postoperative astigmatic correction was 3.73 ± 1.02 (D ± SD). While the mean postoperative myopic correction was 1.86 ± 0.43.
Conclusion: This study proved that Keraring implantation using the femtosecond laser was a successful procedure to correct the optical status of the keratoconic eye. Keraring was found to be best for keratoconus cases with oval, eccentric and oblique cones and with excellent correction of the astigmatic component of keratoconus with good correction of the myopic component of the keratoconus.