Ferrara Paulo, Torquetti Leonardo
J Cataract Refract Surg. 2009 Sep;35(9):1604-8. doi: 10.1016/j.jcrs.2009.04.035.
To report the clinical outcomes of implantation of a new Ferrara intrastromal corneal ring segment (ICRS) with a 210-degree arc length in eyes with keratoconus.
Private eye clinic, Belo Horizonte, Brazil
Statistical analysis included preoperative and postoperative uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), refraction, and keratometry.
Eighty eyes (76 patients) were evaluated. The UDVA improved from 20/350 preoperatively to 20/136 postoperatively and the CDVA, from 20/125 to 20/50; the differences were statistically significant (P = .001 and P = .0001, respectively). Corneal tomography (Pentacam) showed corneal flattening in all eyes. The mean preoperative spherical equivalent decreased from -5.22 diopters (D) preoperatively to -2.26 D postoperatively (P = .050); the mean keratometry (K) 1 value, from 51.49 D to 47.40 D (P = .00014); and the mean K2 value, from 54.33 D to 49.14 D (P = .00022). Two patients required penetrating keratoplasty despite ICRS implantation.
A new ICRS with 210 degrees of arc was effective in treating keratoconus. It improved visual acuity and reduced corneal steepening in selected patients.
报告在圆锥角膜眼中植入新型210度弧长的费拉拉基质内角膜环片（ICRS）的临床结果。
巴西贝洛奥里藏特的私立眼科诊所
统计分析包括术前和术后的未矫正远视力（UDVA）、矫正远视力（CDVA）、验光和角膜曲率测量。
对80只眼（76例患者）进行了评估。UDVA从术前的20/350提高到术后的20/136，CDVA从20/125提高到20/50；差异具有统计学意义（分别为P = 0.001和P = 0.0001）。角膜地形图（Pentacam）显示所有眼的角膜均变平。术前平均等效球镜度从术前的-5.22屈光度（D）降至术后的-2.26 D（P = 0.050）；平均角膜曲率（K）1值从51.49 D降至47.40 D（P = 0.00014）；平均K2值从54.33 D降至49.14 D（P = 0.00022）。尽管植入了ICRS，但仍有2例患者需要进行穿透性角膜移植术。
一种新型的210度弧长的ICRS在治疗圆锥角膜方面是有效的。它提高了选定患者的视力并减少了角膜陡峭度。
