Comparison of 2 ICRS Using Femtosecond Laser for Treatment of Keratoconus
Purpose
To compare between Mayo ring and 355 KERATACx ring implantation technique using femtosecond laser for treatment of keratoconus.
Methods
Fifty eyes of 37 patients suffering from central cone keratoconus. 25 eyes have been treated by a 355 ICRS (A) and 25 eyes have been treated with mayo rings (B). Corneal pocket of 8 mm in diameter have been created using intralase femtosecond laser. 16 patients were male and 21 were female. The age of the patients ranged from 20 years to 42 years (mean 26 years). 16 eyes suffered from mild (average central K-reading (ACK) < 48 diopters (D)), 18 eyes from moderate (48 D < ACK < 52 D) and 16 eyes from advanced (ACK > 52 D) keratoconus. Main criteria for success was patient satisfaction and uncorrected distance visual acuity (UDVA). A particular topographic pattern and postoperative tangential map was done 1 year follow-up postoperatively.
Results
Both groups showed no significant difference regarding postoperative patients satisfaction. The average improvement in UCDVA was 8.4 lines. One eye from group (A) and three eyes from group (B) received a postoperative optimization procedure either by exchanging the implant for one with another thickness or by removal and reimplantation 2 months later. One eye of group (B) finally received karatoplasty.
Conclusion
Both 355 KERATACx ring and Mayo rings were effective for treatment of keratoconus, but 355 KERATACx ring demonstrated a higher efficacy regarding implantation technique, reversability and post operative side effects than Mayo rings.