Dataset Information

Femtosecond Laser Implantation of a 355-Degree Intrastromal Corneal Ring Segment in Keratoconus: A Three-Year Follow-Up.

ABSTRACT: Purpose:To evaluate the outcomes of femtosecond laser-assisted implantation of a 355-degree intracorneal ring (ICR) (Keraring) in patients with keratoconus in the three-year follow-up. Setting:Future Femtolaser Center, Sohag, Egypt. Design:Prospective interventional case series. Patients and Methods:A prospective case series of 38 eyes of 26 patients with keratoconus had implantation of the 355-degree ICR keraring after tunnel creation with a femtosecond laser. The uncorrected visual acuities (UCVA) and best-corrected visual acuities (BCVA), sphere, cylinder, and manifest refraction spherical equivalent (SE), and mean keratometry (K), K max, and K min were evaluated preoperatively and 3, 6, 12, 24, and 36 months postoperatively, and all complications were reported. Results:38 eyes of 26 patients with mean age 25.92?±?5.44 years were enrolled in the study, 11 were males (42.3%). The mean UCVA improved from 0.93?±?0.21 to 0.63?±?0.21 logMAR (P ? 0.001) and the mean BCVA from 0.67?±?0.22 to 0.43?±?0.26 logMAR (P < 0.001). The mean sphere, cylinder, and spherical equivalent have been changed dramatically from preoperative to 3 month postoperative, which is statistically significant (P ? 0.001), and the changes between 1 and 2 years and 2 and 3 years are also considerable and statistically significant; the K max and K min and K mean improved and the changes were statistically significant (P ? 0.001), and the changes between one, two, and three years were also statistically significant. The safety and efficacy indices were changed through the three-year follow-up. The complications were corneal neovascularization (36.84%), corneal melting (26.3%), and ring extrusion (31.5%) at the end of the study. Conclusions:Implantation of a 355-degree intracorneal keraring using femtosecond laser improved the visual, refractive, and topographic parameters in keratoconus patients, with a high rate of ICR extrusion and instability. The study has been registered for the Pan African Clinical Trial Registry (http://www.pactr.org) database within No: PACTR201810796878908 on 29 October 2018.

SUBMITTER: Abdellah MM

PROVIDER: S-EPMC6803737 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature

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Femtosecond Laser Implantation of a 355-Degree Intrastromal Corneal Ring Segment in Keratoconus: A Three-Year Follow-Up.

Abdellah Marwa Mahmoud MM Ammar Hatem Gamal HG

Journal of ophthalmology 20191009

<h4>Purpose</h4>To evaluate the outcomes of femtosecond laser-assisted implantation of a 355-degree intracorneal ring (ICR) (Keraring) in patients with keratoconus in the three-year follow-up.<h4>Setting</h4>Future Femtolaser Center, Sohag, Egypt.<h4>Design</h4>Prospective interventional case series.<h4>Patients and methods</h4>A prospective case series of 38 eyes of 26 patients with keratoconus had implantation of the 355-degree ICR keraring after tunnel creation with a femtosecond laser. The u ...[more]

PMID: 31687200

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Project description:Purpose:To evaluate a new tangential map-based nomogram versus the axial map-based nomogram for ICRS in keratoconus. Methods:A prospective case series study including 64 eyes of 64 patients who underwent ICRS implantation. Cone location was determined for each eye with two maps: the axial and the tangential. Appropriate ring selection was determined using two surgical nomograms: axial map-based and tangential map-based. Visual, refractive, and topographic outcomes were assessed before, as well as at 3, 6, and 12 months after ICRS implantation. Results:The cone location, and consequently the ring selection, was significantly different in the two nomograms with a "centralization tendency" in the tangential map. In the axial group, UDVA and CDVA improved from 0.12?±?0.04 and 0.24?±?0.08 to 0.28?±?0.08 and 0.4?±?0.1, respectively. Similarly, MRSE substantially decreased from -6.7?±?3.3 to -1.2?±?1.1D at 12 months after the procedure. In the tangential group, UDVA and CDVA improved from 0.09?±?0.06 and 0.2?±?0.1 to 0.5?±?0.2 and 0.7?±?0.2, respectively. MRSE substantially decreased from -4.9?±?1D at 12 months after the procedure. In the tangential group, UDVA and CDVA improved from 0.09?±?0.06 and 0.2?±?0.1 to 0.5?±?0.2 and 0.7?±?0.2, respectively. MRSE substantially decreased from -4.9?±?1D at 12 months after the procedure. In the tangential group, UDVA and CDVA improved from 0.09?±?0.06 and 0.2?±?0.1 to 0.5?±?0.2 and 0.7?±?0.2, respectively. MRSE substantially decreased from -4.9?±?1P=0.01 ? . Similarly, the gain in the CDVA was 0.4 and 0.15 in the tangential and axial groups, respectively, at 12 months, P=0.01 ? . Similarly, the gain in the CDVA was 0.4 and 0.15 in the tangential and axial groups, respectively, at 12 months. Conclusion:The tangential map-based nomogram attained better visual and refractive outcomes at 1 year. In addition, the cone location was significantly different between both maps with a centralization tendency in the tangential one.

Dataset Information

Femtosecond Laser Implantation of a 355-Degree Intrastromal Corneal Ring Segment in Keratoconus: A Three-Year Follow-Up.

Publications

Femtosecond Laser Implantation of a 355-Degree Intrastromal Corneal Ring Segment in Keratoconus: A Three-Year Follow-Up.

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