【摘要】目的:比较波前像差仪与主观验光法对屈光度检查的结果,探讨波前像差仪对低阶像差测量的可靠性和准确性。
方法:对200707/200710在我院拟行准分子激光角膜屈光手术的患者88例168眼,分别使用以HartmannShack原理为基础设计的德国蔡司WASCA波前像差仪分析系统以及主观插片验光方法进行检查,并对近视球镜、近视柱镜、散光轴向的结果比较、分析。
结果:波前像差仪与主观验光测量的屈光度较为接近,等效球镜度分别为6.53±1.64D和6.44±1.89D;近视球镜度分别为5.93±1.65D和5.83±1.80D;近视柱镜度分别为1.22±0.66D和1.27±0.70D;散光轴向度分别为110.67±75.69°和119.24±74.21°;四组数据的统计学分析均无显著性差异 (P>0.05)。
结论:波前像差仪在无需散瞳的情况下能够较为准确地反映眼屈光度的情况。
【关键词】 波前像差 主观验光 屈光度
Analysis of dioptre results obtained by wavefront analyzer and subjective refraction test
YuMei Jin, Yong Zhong, ZhongHai Wang, Peng Xu, Qian Zha, Hui Du
Department of Ophthalmology, Peking Union Medical College Hospital, Eye Research Center, Chinese Academy of Medical Sciences, Beijing 100730, China
Abstract AIM: To compare the dioptre results obtained by wavefront analyzer and subjective refraction test, respectively, and to evaluate the accuracy and reliability of lowerorder aberrations measured by wavefront analyzer. METHODS: A total of 88 myopia patients (168 eyes), underwent excimer laser corneal refractive surgery in our hospital from July to October, 2007, were examined by Carl Zeiss wavefront analyzer (based on HartmanShack principle) and subjective refraction, respectively. The results of spherical dioptric, cylindrical dioptric and axis of cylinder were compared and analyzed. RESULTS: The results of diopter examined either by wavefront analyzer or subjective refraction showed a high similarity. Spherical equivalent were 6.53±1.64D and 6.44±1.89D; Spherical dioptre were 5.93±1.65D and 5.83±1.80D; cylindrical Spherical were 1.22±0.66D and 1.27±0.70D; axis of cylinder were 110.67±75.69° and 119.24±74.21°, respectively. There were no statistically significant differences among those four groups (P>0.05). CONCLUSION: The wavefront analyzer can provide an accurate and reliable dioptre results in the evaluation of the refractive situation without mydriasis. KEYWORDS: wavefront aberrations; subjective refraction; dioptre
0引言 随着角膜屈光手术的广泛开展,波前像差技术已逐渐被眼科医生所熟知并应用于常规的屈光手术的测量,尤其波前像差引导的个体化切削手术已成为当前角膜屈光手术的热点之一,波前像差理论也越来越受到临床应用的重视,人们不仅仅关注其对高阶像差的测量和角膜屈光手术中的运用,而对低阶像差测量结果的准确性也在进行观察。本文对波前像差仪与传统的验光检查方法的检查结果进行比较,并探讨波前像差仪在常规屈光检查中的准确性和可靠性。
1对象和方法
1.1对象 200707/200710在我院拟行准分子激光角膜屈光手术的患者,进行常规术前检查,排除有角膜炎症、干眼、外伤、以及手术、糖尿病和全身免疫系统疾病者;88例168眼,男25例,女63例,年龄18~50(平均25.45±5.45)岁。主观验光球镜屈光度1.75~11.25D,平均(5.83±1.80)D;柱镜屈光度0.50~3.50D,平均 (1.27±0.70D),患者均为复性近视散光且最佳矫正视力≥1.0者。
1.2方法
1.2.1波前像差仪 采用以HartmannShack原理为基础设计的德国蔡司公司的WASCA波前像差仪分析系统,在暗室环境下无需散瞳,瞳孔直径大于6mm时行波前像差检查,每只眼重复检查3~4次,同时选择原始图对焦理想、中心偏位轴X、Y均小于0.1mm且重复性最好的高阶像差图形及屈光度值。
1.2.2主观验光 先使被检眼的调节作用处于完全松弛状态下进行屈光检影,在药物散瞳检影的客观检查基础上,于次日在自然瞳孔下再进行主观验光,用镜片置于患眼之前,靠患者的判断力寻求最佳的矫正视力,根据所试镜片分别记录近视球镜、柱镜、轴向和最佳矫正视力等。 统计学处理:所有数据采用 SPSS 11.0软件分析,样本t检验。
2结果 对于88例 168眼两种方法测量所得到的:近视球镜、近视柱镜、散光轴向、等效球镜(球镜+1/2柱镜)平均值的结果之间进行统计学分析(表1)。 经统计学分析波前像差仪与主观验光在近视球镜、近视柱镜、散光轴向、等效球镜(球镜+1/2柱镜)的结果比较差异无显著性(P>0.05)。另外,波前像差仪所测得的近视球镜和近视柱镜与主观验光所测得的近视球镜和近视柱镜的差值较为接近(图1)。
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