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L. Fernandez-Vega, J. Alfonso, D. Madrid-Costa, R. Montés-Micó, A. Poo-López, J. Merayo-Lloves; Intra-Stromal Corneal Ring Segment and Posterior Chamber Phakic Intraocular Lens Implantation for Keratoconus Correction. Invest. Ophthalmol. Vis. Sci. 2010;51(13):3475. doi: https://doi.org/.
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© ARVO (1962-2015); The Authors (2016-present)
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.
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.
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.
Sequential Ferrara intracorneal ring-sements and ICL implantation was safe, effective and predictable for keratoconus correction.
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