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Clinical Outcomes After Implantation of 320°-Arc Length Intrastromal Corneal Ring Segments in Keratoconus

2018; Lippincott Williams & Wilkins; Volume: 37; Issue: 10 Linguagem: Inglês

10.1097/ico.0000000000001709

1536-4798

Leonardo Torquetti, Priscila Cunha, Allan Luz, Sérgio Kwitko, Márcio Carrion, Guilherme Rocha, Armando Signorelli, Sandro Coscarelli, Guilherme Ferrara, Frederico Bicalho, Renato Augusto Neves, Paulo Ferrara,

Ocular Surface and Contact Lens

Purpose: To evaluate the clinical outcomes after implantation of a new 320°-arc length Ferrara intrastromal corneal ring segment (320-ICRS) in eyes of patients with keratoconus. Methods: A multicentric nonrandomized study was conducted in which a new 320-ICRS was placed in 138 eyes of 130 patients with keratoconus. Uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), keratometry, corneal volume, asphericity, lines of vision gain/loss, and vectorial analysis were assessed preoperatively and at the final follow-up visit after the procedure. Results: The mean follow-up time was 6.2 ± 3.3 (SD) months (range 3–12 months). Mean UDVA improved from 20/250 to 20/60. Mean CDVA improved from 20/100 to 20/40. Mean Q improved from −1.12 ± 0.49 preoperatively to −0.28 ± 0.51 postoperatively ( P < 0.001). Mean corneal volume increased from 56.2 ± 4.28 mm 3 preoperatively to 57.6 ± 4.74 postoperatively ( P < 0.001). Mean Km reduced from 53.3 ± 5.5 D preoperatively to 47.8 ± 4.6 D postoperatively ( P < 0.001). The change in UDVA, CDVA, and topographic astigmatism was statistically significant ( P < 0.0001). Conclusions: The 320-ICRS can efficiently and safely improve visual acuity in keratoconus, modifying the corneal shape to a more physiologic, aspheric shape.