2026-07-31T05:50:13Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/80642023-08-27T16:27:51Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Alfonso, José F. author Torquetti, Leonardo author Fernández Vega-Cueto, Luis author Allan, Bruce author Poo López, Aranzazu author Alfonso Bartolozzi, Belén author Cruz, José, de la author Monteiro, Tiago author Madrid Costa, David author 2021-04-01 PURPOSE:To assess the outcomes of implanting a new 300° arc-length intrastromal corneal ring segment (ICRS) in moderate to advanced central hyperprolate keratoconus. METHODS:Forty-two eyes with moderate to advanced central hyperprolate keratoconus were evaluated before and after implanting an inferior 300° ICRS (AJL Ophthalmic). The clinical measurements taken included manifest refraction, uncorrected (UDVA) and corrected (CDVA) distance visual acuity (logMAR scale), and corneal tomographic analysis (Sirius; Costruzioni Strumenti Oftalmici). Changes in the anterior and posterior corneal surfaces and the root mean square (RMS) for coma-like aberrations for a pupil size of 4.5 mm were evaluated. All examinations were performed before surgery and 6 months after surgery. RESULTS:The mean UDVA improved from 1.12 ± 0.48 logMAR preoperatively to 0.73 ± 0.37 logMAR postoperatively (P < .0001). The mean CDVA changed from 0.33 ± 0.20 to 0.20 ± 0.11 logMAR (P < .0001). Postoperatively, the CDVA improved by two or more lines in 45.2% of the eyes and increased by one line in 19.04%, and none of the patients lost lines of CDVA. All of the anterior and posterior corneal tomographic parameters analyzed were significantly improved after surgery, except posterior flat keratometry, which remained unchanged. In 80.95% of the eyes, the postoperative mean keratometry was 50.00 diopters or less. The 6-month RMS for coma-like aberrations also declined significantly from 1.57 ± 0.68 to 1.06 ± 0.42 µm after surgery (P < .0001). CONCLUSIONS:These results suggest that implanting a 300° arc-length ICRS is a safe and effective procedure for treating patients with moderate to advanced central hyperprolate keratoconus and clear cornea. 1081-597X 10.3928/1081597X-20210115-01 https://hdl.handle.net/20.500.14352/8064 https://doi.org/10.3928/1081597X-20210115-01 https://journals.healio.com/doi/full/10.3928/1081597X-20210115-01 Visual and Tomographic Outcomes of a 300° Arc-length ICRS Implantation in Moderate to Advanced Central Keratoconus