title: Intrastromal corneal ring segment implantation (keraring 355°) in patients with central keratoconus: 6-month follow-up.
abstract: We evaluate the efficacy and safety of Keraring 355° intrastromal corneal ring segment (ICRS) implantation aided by PocketMaker microkeratome for the correction of keratoconus. Patients underwent ICRS insertion using mechanical dissection with PocketMaker microkeratome and completed 6 months of follow-up. Uncorrected visual acuity (UCVA), best spectacle-corrected visual acuity (BSCVA), refraction, topographic findings, safety, efficacy index, and adverse events were reported for six months postoperatively. We evaluated 15 eyes of 15 patients (12 men) with a mean age of 28.87 ± 6.94 years (range 21-49 years). At final postoperative examination, there was a statistically significant reduction in the spherical equivalent refractive error compared to preoperative measurements (-5.46 ± 1.52 to -2.01 ± 1.63 D, P < 0.001). Mean preoperative UCVA (logMAR) before implantation was 0.79 ± 0.48, and postoperative UCVA was 0.28 ± 0.15, P = 0.001. Mean preoperative BSCVA (logMAR) before implantation was 0.36 ± 0.21; at final follow-up examination BSCVA was 0.18 ± 0.9, P = 0.009. Mean K decreased from 48.33 to 43.31 D, P < 0.001. All patients were satisfied with ICRS implantation; 86.7% were moderately to very happy with the results. No intraoperative or postoperative complications were demonstrated. This preliminary study shows that ICRS (Keraring 355°) implantation is an efficient, cost-effective, and minimally invasive procedure for improving visual acuity in nipple type keratoconic corneas.
authors: Department of Ophthalmology, Bina Eye Hospital Research Center, Tehran 1914853184, Iran.
authors: Khosrow
authors: K
authors: Jadidi
authors: Department of Ophthalmology, Bina Eye Hospital Research Center, Tehran 1914853184, Iran.
authors: Seyed Aliasghar
authors: SA
authors: Mosavi
authors: Department of Ophthalmology, Bina Eye Hospital Research Center, Tehran 1914853184, Iran.
authors: Farhad
authors: F
authors: Nejat
authors: Department of Ophthalmology, Bina Eye Hospital Research Center, Tehran 1914853184, Iran.
authors: Mostafa
authors: M
authors: Naderi
authors: Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences (TUMS), Tehran, Iran.
authors: Leila
authors: L
authors: Janani
authors: Department of Biostatistics, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran.
authors: Sara
authors: S
authors: Serahati