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准分子激光屈光性角膜切削术矫正散光的准确性及预测性   总被引:5,自引:0,他引:5  
目的 探讨准分子激光屈光性角膜切削术(excimer laser photorefractive kerectomy,PRK)矫正散光的准确性及预测性。方法 根据角膜地形图提供的角膜屈光力数值,用Holladay法计算复性近视散光30例(53只眼)和单纯近视23例(33只眼)患者术前与术后6个月角膜屈光力的差值,确定实际矫正散光度及轴位,及预期矫正散光度及轴位进行对比分析。结果 复性近视散光组53  相似文献
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应用视神经纤维分析仪检测正常人视网膜神经纤维层厚度   总被引:3,自引:0,他引:3  
目的 探讨正常人的视网膜神经纤维层厚度及其象限比值与年龄的关系。方法 应用视神经每人义检测198例(198只眼)正常志愿者,并按年龄分组进行统计分析。结果 RNFLT与年龄成负相关,上、下方象限厚度较鼻、颞侧大,与年龄相关、鼻、颞侧无此特点。上、下方象限厚度比值平均为1.041。结论 NFA是测量RNFLT的可靠方法,正常人的RNFLT随年龄的增长而减少。  相似文献
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PURPOSE: To investigate the relationship between muscular asthenopia and eccentric ablation after photorefractive keratectomy (PRK). METHODS: Sixteen eyes of eight myopic patients whose muscular asthenopia was corrected by subjectively accepted spectacle prism after PRK, with visual acuity better than 0.8, were followed for 6 to 14 months. On the basis of preoperative and post-operative data and corneal topography, we calculated the total corrected corneal power using the Holladay formula and then measured the ablation eccentricity (h, millimeters) and its direction. According to the formula delta approximately equals Dh, the prism effective value (delta) caused by the eccentric ablation was computed and compared with the objectively accepted spectacle prism. RESULTS: The subjectively accepted spectacle prisms were similar to calculated values from the formula. Mean difference was 0.10 +/- 0.25delta. The direction of the subjectively accepted prism was in the direction of the ablation deviation. CONCLUSIONS: Eccentric ablation is an important cause of muscular visual asthenopia after PRK. The asthenopia may be corrected by spectacle prism. The spectacle prism value may be estimated by the formula delta approximately equals Dh.  相似文献
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