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Purpose: To assess the changes in visual acuity and topographic indices after implantation of single-segment Intacs. Methods: Forty-two keratoconic eyes received Femtosecond-assisted single-segment Intacs. Uncorrected distance visual acuity (UDVA) and best spectacle corrected visual acuity (BSCVA), refractive error, keratometry (K1, K2, Km, and KMax.), and seven Pentacam measured topographical indices; index of surface variance (ISV), index of vertical asymmetry (IVA), keratoconus index (KI), central keratoconus index (CKI), index of height asymmetry (IHA), index of height decentration (IHD), and minimum radius of curvature (R Min) were assessed 4 months after surgery. Correlations between changes of visual acuity and topographical indices changes were evaluated. Results: UDVA increased from 0.92 ± 0.35 to 0.49 ± 0.31 logMAR (P

Purpose The aim of this study was to evaluate the effect of femtosecond laser-assisted intrastromal corneal ring segment (ICRS) implantation in patients with keratoconus on the visual outcome and corneal biomechanics using CORVIS ST. Patients and methods This is a prospective interventional study that was carried out on 30 keratoconic eyes which underwent femtosecond laser-assisted ICRS implantation. All the included eyes were assessed before ICRS implantation for uncorrected/best-corrected visual acuity, Pentacam and Corvis ST imaging. They were assessed again at 1 and 3 months after the implantation for the same parameters. Results The mean age of the studied group was 24.00±3.80 years. The uncorrected corrected visual acuity improved significantly at the first (0.36±0.04, P

Aims The aim of the study was to evaluate the refractive, topometric and aberrometric changes in corneas with keratoconus treated with femtosecond laser intracorneal ring segment (ICRS) implantation following a proposed modified nomogram. Settings and design This is a retrospective, consecutive case series. Materials and methods ICRS implantation using the new proposed nomogram was performed in 10 eyes of seven patients with type 1 and type 2 keratoconus. Corneal tunnels were created using femtosecond laser, and KeraRings were inserted in all eyes. All cases were followed up every 3 months for 6 months using the Pentacam Phoenix system. Statistical analysis All analyses were performed with SPSS for windows 2007. Results None of our patients developed complications related to ring placement, such as migration, extrusion or infection. In this limited case series an improvement was seen in uncorrected visual acuity (P 0≤ 0.05), best spectacle corrected visual acuity (P ≤ 0.001) and refraction at 6 months (P < 0.001). Keratometric readings improved (P < 0.001), with flattening of the cornea. Corneal aberrations showed significant reduction when analysed by Zernike (P < 0.001) and Fourier analysis ( P ≤ 0.001). Corneal asphericity (Q value) also showed improvement (P < 0.05). Conclusion Femtolaser ICRS implantation using the proposed modified nomogram showed promising results in improving refraction, visual acuity, corneal topography and aberrations in patients with keratoconus.