Purpose
Outcome Analyisis of a combination of Intracorneal ring segment (ICRS) both Ferrara and Intacts, for correction of central keratoconus.
Methods
13 eyes of 8 patients with contact lens intolerance or progressive central keratoconus underwent ICRS surgery and were followed for at least 6 months. Tectonic outcome were evaluated as a reduction of the keratometric (K) values: K minimal (Kmin) and K maximal (Kmax)).Visual outcome were measured as improve in uncorrected distance visual acuity (UDVA), best corrected visual acuity (CDVA), and refractive error (myopia and astigmatism) reduction (decimal scale). Data were processed with R-programing language for descriptive and inference statistical analysis.
Results
There was a reduction of keratometric values Kmax-pre 45,91 ± 3,50 to Kmax-post 43,41 ± 3,03). Regarding VA(Decimal Scale) Mean UDVA change in from 0,33± 0,19 to 0,66± 0,26. Mean DCVA change from 0,86 ± 0,20 to 0,94± 0,18. Myopic and astigmatism components were highly reduced after ICRS implantation. Myopia was reduced from -2,34± 2,31 to -1,13± 0,99. Astigmatism was reduced from -2,00± 1,39 to -0,56± 0,82. No intraoperative and postoperative complications occurred in these eyes.
Conclusions
The combination of Ferrara and Intacs ICRS implantation archive good tectonic and refractive outcome in the care of patients with keratoconus. Nomograms for ICRS implantation should be changed and customized in order to archive standart refractive outcome.
Keywords: 574 keratoconus •
681 refractive surgery: corneal topography •
682 refractive surgery: other technologies