Abstract
Purpose: :
Outcome analysis the efficacy, safety and predictability of sequential PMMA Ferrara Ring-sements (Ferrara ring, Boecillo, Spain and Keraring, Belo Horizonte, Brasil) and posterior chamber intraocular Collamer lens (ICL) implantation for keratoconus correction.
Methods: :
Charts form 18 eyes of 14 keratocunus patients who had sequential implantation of the PMMA Ring-sements and an ICL were evaluated. ICL implantation was performed 6 months after PMMA Ring-sements implantation. Uncorrected distance visual acuity (UCVA), best corrected distance visual acuity (BCVA), uncorrected distance near visual acuity (UCNVA), best distance-corrected near visual acuity (BCNVA) and residual refractive errors analyzed using vector analysis were recorded at 6 months post- PMMA Ring-sements implantation and 6 months after ICL implantation.
Results: :
The mean UCVA (Snellen decimal) changed from 0.1 ± 0.05 before surgery to 0.2 ± 0.11 six months after PMMA Ring-sements implantation (P= 0.01) and to 0.6 ± 0.19 six months after ICL implantation (P< 0.0001). The BCVA changed from 0.7 ± 0.19 before surgery to 0.8 ± 0.20 six months after PMMA Ring-sements implantation (P= 0.002) and to 0.8 ± 0.14 six months after ICL implantation (P= 0.0007). The efficacy and safety indexes at 6 months of ICL implantation were 0.93 and 1.22, respectively. 78.95% of eyes were within ±1.00 diopters (D) and 47.37 % were within ±0.50 D of the desired refraction. The mean spherical equivalent after ICL implantation was - 0.651 ± 0.810D.
Conclusions: :
Sequential Ferrara intracorneal ring-sements and ICL implantation was safe, effective and predictable for keratoconus correction.
Keywords: keratoconus • refractive surgery: phakic IOL