Efficacy of radial keratotomy in the optical rehabilitation of mild to moderate keratoconus cases

Abstract

AIM: To investigate the efficacy of radial keratotomy (RK) for the optical and visual rehabilitation of mild to moderate keratoconus. METHODS: Thirty-one eyes of 22 keratoconus patients with at least 12 mo follow-up were recruited and reviewed retrospectively. Uncorrected visual acuity (UCVA), best spectacle corrected visual acuity (BSCVA), autorefractometer values, keratometric values, corneal irregularity indexes, and complications were analyzed pre- and post-operatively. RESULTS: At the last follow-up visit, mean UVCA (logMAR) improved significantly from 0.86±0.34 to 0.30±0.29 (P<0.0001), and mean BSCVA (logMAR) improved from 0.47±0.21 to 0.17±0.23, (P<0.0001). Mean keratometric values decreased from 48.69±3.68 to 44.33±3.09 diopters (P<0.0001). Mean spherical equivalent measured by autorefractometer was also improved significantly from -5.61±2.85 to -2.29±1.95 at the last follow-up visit (P<0.0001). Central corneal thickness and corneal irregularity index of 3 mm and 5 mm zones did not change during the overall follow-up time. No serious intraoperative or postoperative complication was observed. CONCLUSION: RK is assessed as an effective treatment method for the optical and visual rehabilitation of mild to moderate keratoconus cases, according to our results in a selected group of keratoconus patients.

摘要 目的:探讨放射状角膜切开术在轻中度圆锥角膜治疗中光 学和视力康复的效果。 方法:回顾性分析应用放射状角膜切开术治疗圆锥角膜的 病例 22 例 31 眼并进行了至少 12mo 的随访。 测量并分析 术前术后裸眼视力,最佳矫正视力,自动屈光计值,角膜曲 率,角膜不规则指数以及并发症。 结果:在最后一次随访中,平均裸眼视力(logMAR)由 0. 86依 0. 34 显著提升至 0. 30依0. 29 (P<0. 0001),平均最佳矫正 视力由 0. 47依0. 21 提升至 0. 17依0. 23(P<0. 0001)。 平均 角膜曲率由 48. 69 依 3. 68D 降低至 44. 33 依 3. 09D ( P < 0郾 0001)。 自动屈光计测得平均等效球镜值由-5. 61 依2. 85D 显著提升至-2. 29依1. 95D(P<0郾 0001)。 在整个随访 过程中,中央角膜厚度和 3mm,5mm 区域的角膜不规则指 数均无变化。 术中和术后没有观察到严重并发症。 结论:在本组病例中,放射状角膜切开术是轻中度圆锥角 膜视觉康复的有效治疗方法.