Complete Ring Versus ICRS Femtosecond Laser-Assisted Implantation for Keratoconus
Narrative Responses:
Purpose
To compare complete ring implantation versus ICRS implantation to correct keratoconus.
Methods
Thirty eyes of keratoconic patients were included. 15 eyes had Femtosecond assisted Myoring corneal implantation (G1) and 15 had Femtosecond assisted Keraring segments (G2). Changes in UCVA, BCVA, Mean K (Km), sphere, topographic cylinder, and Q value were recorded in all eyes between preoperative values and 6 weeks postoperatively.
Results
In G1 the Km change was -6.15D, the UCVA change was -0.57 (LogMar), BCVA change was -0.2 (LogMar) and the Q value change was 0.43. In G2 the Km change was -3.15D, the UCVA change was -0.48 (LogMar), BCVA change was -0.09 (LogMar) and the Q value change was 0.5. All means of both groups were not significantly different except for the Km change which was statistically significantly more in G1 (P=0.05).
Conclusion
Both Complete rings and ring segments implantation are effective for improving corneal and visual parameters in keratoconus. Complete ring implantation may have a more flattening effect on the anterior corneal surface.