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首页> 外文期刊>Journal of refractive surgery >Contrast sensitivity after LASIK flap creation with a femtosecond laser and a mechanical microkeratome.
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Contrast sensitivity after LASIK flap creation with a femtosecond laser and a mechanical microkeratome.

机译：飞秒激光和机械微角膜刀在LASIK皮瓣制作后的对比敏感度。

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摘要

PURPOSE: To compare the effects on contrast sensitivity of the IntraLase femtosecond laser for flap creation (IntraLASIK) and standard LASIK for myopia. METHODS: Two hundred eyes of 100 consecutive patients underwent LASIK treatment using the VISX S2 laser system. The femtosecond laser (15 kHz IntraLase) was used for flap creation in 100 eyes (50 patients) and a mechanical microkeratome (Carriazo-Barraquer) was used in 100 eyes (50 patients). Best spectacle-corrected contrast sensitivity was measured before and 6 months postoperatively in the IntraLASIK and mechanical LASIK groups. The IntraLASIK and mechanical LASIK-induced changes in contrast sensitivity were compared under photopic (85 cd/m2) and mesopic (5, 2.5, and 0.1 cd/m2) conditions. RESULTS: Contrast sensitivity for eyes after IntraLASIK did not differ from preoperative values at the photopic level (85 cd/m2). However, under mesopic conditions, a statistically significant reduction (P < .01) in contrast sensitivity was found at high spatial frequencies (12 and 18 cpd), although no significant contrast sensitivity differences were observed at low and middle spatial frequencies (P > .01 for 1.5, 3, and 6 cpd). No statistically significant differences were found between IntraLASIK and mechanical LASIK for 1.5, 3, and 6 cpd at any luminance level (P > .01). IntraLASIK showed better contrast sensitivity than mechanical LASIK under mesopic conditions at 12 cpd and photopic and mesopic conditions at 18 cpd (P < .01). CONCLUSIONS: IntraLASIK surgery demonstrated better contrast sensitivity at high spatial frequencies under photopic and mesopic conditions than mechanical LASIK.
机译：目的：比较IntraLase飞秒激光对皮瓣产生（IntraLASIK）和标准LASIK近视对对比敏感度的影响。方法：使用VISX S2激光系统对100例连续患者的200眼进行了LASIK治疗。飞秒激光（15 kHz IntraLase）用于100只眼（50例）的皮瓣制作，而机械微角膜刀（Carriazo-Barraquer）用于100只眼（50例）。在IntraLASIK和机械LASIK组中，术前和术后6个月测量了最佳的眼镜校正对比敏感度。在明视（85 cd / m2）和中视（5、2.5和0.1 cd / m2）条件下比较了IntraLASIK和机械LASIK引起的对比敏感度变化。结果：IntraLASIK术后眼睛的对比敏感性与明视水平（85 cd / m2）的术前值无差异。然而，在中观条件下，在高空间频率（12和18 cpd）下，对比敏感度在统计学上有显着降低（P <.01），尽管在中低空间频率（P>）下没有观察到明显的对比敏感度差异。对于1.5、3和6 cpd为01）。在任何亮度水平下，IntraLASIK和机械LASIK在1.5、3和6 cpd下均未发现统计学上的显着差异（P> .01）。 IntraLASIK在中视条件下（cpd为12 cp）以及在视力和中视条件下（cpd为18 cpd）显示出比机械LASIK更好的对比度敏感度（P <.01）。结论：与机械性LASIK相比，IntraLASIK手术在高空间频率下在明视和中视条件下表现出更好的对比敏感度。

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