RT Journal Article
T1 Evaluation of a new nomogram for Ferrara ring segment implantation in keratoconus.
A1 Fernández, Joaquín
A1 Peris-Martínez, Cristina
A1 Pérez-Rueda, Antonio
A1 Hamida Abdelkader, Sidi Mohamed
A1 Roig-Revert, María José
A1 Piñero, David P
K1 Ferrara ring segment
K1 coma aberration
K1 femtosecond
K1 intracorneal ring segment
K1 keratoconus
AB To evaluate the short-term clinical outcomes of Ferrara rings in keratoconus using an optimized nomogram developed after several years of research and retrospective analysis of clinical data. This prospective longitudinal non-comparative clinical trial evaluated 88 eyes of 88 patients (age 18-62y) with keratoconus diagnosis from two Spanish centers. Ferrara ring segment (AJL Ophthalmic) implantation was performed in all cases, using the mechanical procedure in 25 eyes (28.4%) and a femtosecond laser-assisted procedure in 63 eyes (71.6%). The ring segments implanted in each case were selected using a new optimized nomogram that considered variables such as anterior corneal asphericity and astigmatism or the discrepancy among astigmatism and coma orientations. Visual, refractive, corneal topographic, aberrometric, and pachymetric changes after surgery were evaluated during a 3-month follow-up. The implants induced a significant refractive change as well as an improvement in uncorrected (UDVA) and corrected distance visual acuity (CDVA; P The implantation of Ferrara rings based on the nomogram evaluated is safe and effective for promoting a visual rehabilitation in keratoconus, with a relevant control of primary coma aberration.
SN 2222-3959
YR 2021
FD 2021-09-18
LK http://hdl.handle.net/10668/18527
UL http://hdl.handle.net/10668/18527
LA en
DS RISalud
RD Apr 12, 2025