Basir Eye Center, Tehran, Iran.
J Refract Surg. 2009 Dec;25(12):1075-82. doi: 10.3928/1081597X-20091117-06.
To evaluate visual outcomes of LASIK in eyes with high astigmatic refractive errors with low spherical component.
We prospectively evaluated cross cylinder LASIK in patients with high astigmatic eyes with low spherical component over a 2-year period. All laser surgeries were performed with the NIDEK EC-5000 excimer laser. We used power vectors (M [spherical equivalent] and J(0), and J(45) [cylinder]) to analyze the astigmatic results. Main outcome measures were uncorrected visual acuity (UCVA), best spectacle-corrected visual acuity (BSCVA), manifest refraction, and complications.
Thirty-four eyes of 22 patients were included. Patients were followed for 21.8+/-3.7 months. At the last examination, UCVA of 20/40 or better was observed in 33 (97.1%) eyes. Best spectacle-corrected visual acuity after LASIK improved significantly in comparison to BSCVA before surgery (P<.005). Mean preoperative cylinder was -4.73+/-0.89 diopters (D) (range: -4.00 to -7.00 D), which decreased to -0.29+/-0.47 D (range: 0.00 to -1.50 D) at last follow-up (P<.001). Reduction in the magnitude of power vectors was 92.4% for M, 103.2% for J(0), and 76.4% for J(45). No cases of post-operative astigmatic regression or corneal haze were observed.
Cross cylinder LASIK with the NIDEK EC-5000 excimer laser is a successful procedure for correcting high astigmatism and improving vision.
评估低球镜成分高度散光眼行 LASIK 的视力结果。
我们前瞻性地评估了 2 年内高度散光眼且低球镜成分患者行交叉圆柱镜 LASIK 的结果。所有激光手术均使用 NIDEK EC-5000 准分子激光进行。我们使用功率向量（M [等效球镜] 和 J(0)、J(45) [散光轴]）分析散光结果。主要观察指标为未矫正视力（UCVA）、最佳矫正视力（BSCVA）、验光结果和并发症。
共纳入 22 例患者的 34 只眼。患者随访 21.8±3.7 个月。末次随访时，33 只眼（97.1%）UCVA 达到 20/40 或以上。LASIK 后最佳矫正视力较术前明显提高（P<.005）。术前平均散光为-4.73±0.89 屈光度（D）（范围：-4.00 至-7.00 D），末次随访时降至-0.29±0.47 D（范围：0.00 至-1.50 D）（P<.001）。M 的功率向量减少 92.4%，J(0)为 103.2%，J(45)为 76.4%。无术后散光回退或角膜混浊病例。
NIDEK EC-5000 准分子激光行交叉圆柱镜 LASIK 是矫正高度散光和提高视力的有效方法。
