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目的 :观察波前像差引导的LASIK手术矫正近视性散光的效果。方法 :2 8例 35只眼 ,平均术前球镜屈光度为 (- 4.8± 2 .3)D ,柱镜屈光度为 (- 1.1± 0 .9)D。手术前和手术后均使用Tscherning像差计测量 ,分析波前像差。应用 1.0mm光斑、频率 2 0 0Hz的飞点扫描准分子激光进行屈光手术。结果 :术后 3个月 ,6 8.0 %的眼屈光度在± 0 .5D(正视眼 )内 ,93.5 %眼在± 1.0D内。 93.5 %的裸眼视力为 2 0 / 2 0或更好。裸眼超常视力(BSCVA在 2 0 / 10或更好 )占 16 .0 %。高阶像差 (球差 ,彗差 )矫正不足 ,而波前像差全部均方根增加值为 1.44± 0 .74,彗差的矫正好于球差。结论 :波前像差引导的LASIK手术是一种很可靠的技术 ,可有效地矫正屈光不正 ,改善视觉敏感度 ,提高视觉质量 ,尤其是提高夜间视力的视觉质量。
Objective: To observe the effect of wavefront-guided LASIK on myopic astigmatism. Methods: Twenty - eight eyes (35 eyes) with mean preoperative spherical refraction of (-4.8 ± 2.3) D and cylindrical refraction of (-1.1 ± 0.9) D were studied. Before and after surgery were used Tscherning aberrometer measurements, analysis of wavefront aberrations. Refractive surgery was performed using a 1.0 mm spot and a flying-spot excimer laser at a frequency of 200 Hz. RESULTS: At 3 months postoperatively, 6 8.0% of the eye refractive power was within ± 0.5D (eyelid) and 93.5% within ± 1.0D. 93.5% of uncorrected visual acuity is 20/20 or better. Uncorrected visual acuity (20% BSCVA or better) accounted for 16.0%. High-order aberrations (spherical aberration, coma) were not corrected, while the total RMS value of wavefront aberration was 1.44 ± 0.74, and correction of coma was better than spherical aberration. CONCLUSIONS: LASIK guided by wavefront aberration is a very reliable technique that can effectively correct refractive errors, improve visual acuity and improve visual quality, especially visual acuity at nighttime.