Mohamed Omar Yousif1, Azza Mohamed Ahmed Said2. 1. From the Ophthalmology Department, Faculty of Medicine, Ain Shams University, Cairo, Egypt. 2. From the Ophthalmology Department, Faculty of Medicine, Ain Shams University, Cairo, Egypt. Electronic address: dr_azza_22@hotmail.com.
Abstract
PURPOSE: To compare the visual acuity, refraction, corneal topography, and corneal asphericity of intrastromal corneal implantation of Keratacx 160-degree 2 symmetrical ring segment, the Keratacx 320-degree near-total ring, and the Myoring continuous intracorneal ring (ICR) in central keratoconus. SETTING: Ophthalmology Department, Ain Shams University, Cairo, Egypt. DESIGN: Prospective case series. METHODS: Surgeries were performed using a femtosecond laser for tunnel creation for the 160-degree 2-segment device (Group 1) and the 320-degree near-total ring (Group 2), and for pocket creation for the ICR (Group 3). The preoperative and 6-month postoperative uncorrected (UDVA) and corrected (CDVA) distance visual acuities, spherical equivalent (SE), corneal and refractive astigmatism, keratometry (K) readings, and Q value using topography images were acquired. RESULTS: The study included 73 eyes. No statistically significant differences were found in the preoperative parameters between groups (P > .05). The postoperative UDVA, CDVA, SE, corneal and refractive astigmatisms, K readings, and Q value were statistically better than the preoperative parameters in all study groups (P < .01). A statistically significant increase in the median UDVA and CDVA occurred in Group 2 compared with Group 1 (P < .01). Groups 2 and 3 had a more effective reduction in SE (P < .01). No statistically significant difference was found in the postoperative changes in the corneal and refractive cylinders, mean and maximum K readings, and corneal asphericity between the study groups (P > .05). CONCLUSIONS: All devices were effective in improving UDVA, CDVA, refraction, K readings, and corneal asphericity. The 320-degree segment and ICR improved UDVA and SE more than the 2-segment device.
PURPOSE: To compare the visual acuity, refraction, corneal topography, and corneal asphericity of intrastromal corneal implantation of Keratacx 160-degree 2 symmetrical ring segment, the Keratacx 320-degree near-total ring, and the Myoring continuous intracorneal ring (ICR) in central keratoconus. SETTING: Ophthalmology Department, Ain Shams University, Cairo, Egypt. DESIGN: Prospective case series. METHODS: Surgeries were performed using a femtosecond laser for tunnel creation for the 160-degree 2-segment device (Group 1) and the 320-degree near-total ring (Group 2), and for pocket creation for the ICR (Group 3). The preoperative and 6-month postoperative uncorrected (UDVA) and corrected (CDVA) distance visual acuities, spherical equivalent (SE), corneal and refractive astigmatism, keratometry (K) readings, and Q value using topography images were acquired. RESULTS: The study included 73 eyes. No statistically significant differences were found in the preoperative parameters between groups (P > .05). The postoperative UDVA, CDVA, SE, corneal and refractive astigmatisms, K readings, and Q value were statistically better than the preoperative parameters in all study groups (P < .01). A statistically significant increase in the median UDVA and CDVA occurred in Group 2 compared with Group 1 (P < .01). Groups 2 and 3 had a more effective reduction in SE (P < .01). No statistically significant difference was found in the postoperative changes in the corneal and refractive cylinders, mean and maximum K readings, and corneal asphericity between the study groups (P > .05). CONCLUSIONS: All devices were effective in improving UDVA, CDVA, refraction, K readings, and corneal asphericity. The 320-degree segment and ICR improved UDVA and SE more than the 2-segment device.
Authors: Mazen M Sinjab; Roy S Rubinfeld; Kirsten Wagner; Edward C Parsons Jnr; Arthur B Cummings; Michael W Belin Journal: Clin Ophthalmol Date: 2021-03-29
Authors: Miguel Ángel Ariza-Gracia; Julio Flecha-Lescún; Philippe Büchler; Begoña Calvo Journal: Transl Vis Sci Technol Date: 2020-10-21 Impact factor: 3.283