弥散斑验光仪的设计  

A Design of Refractometer Based on Blur Circle

作　　者：张逸夔[1] 黄胜海[1] 叶慧芳[1] 邹睿韬[1] 童耿民[1] 卓然[1] 陶育华[1] 

机构地区：[1]温州医学院眼视光学院,浙江省温州市325027

出　　处：《中国医疗器械杂志》2011年第2期103-107,共5页Chinese Journal of Medical Instrumentation

基　　金：2010年浙江省大学生科技创新活动计划(新苗人才计划)项目

摘　　要：目的利用人眼屈光弥散斑原理,设计一款使用方便、性能稳定的验光仪。方法根据理论分析和Zemax软件模拟,搭建弥散斑验光仪光路,设计计算参数;在临床上初步收集近视、散光患者的检查结果,并和温州医学院附属眼视光医院的验光结果进行比较。结果 Zemax模型眼仿真、系统变量分析和临床试用结果表明,弥散斑验光仪原理可靠,性能稳定。在瞳孔直径为4mm,节点至中心凹距离NO'为20mm的参数条件下,具有良好的验光精度。近视组和散光轴向测量组与医院验光结果的对照t检验为阴性*P>0.05);近视组数据测量稳定,90%患者3次测量结果小于0.25D;散光度数组测量结果对照t检验为阳性(P=0.041),80%与医院验光结果相差0.75D以内。结论弥散斑验光仪性能稳定,使用方便,结果比较客观,有望成为新型验光设备。Objective Design a convenient and stable eye refractometer based on the theory of blur circle. Methods Analyze the retinal blur circle in both Emsly reduced eye model and Liou ＆ Brennan 1997 eye model by ZEMAX. Design the coefficients including PD （pupil diameter） and NO＇ （length between node point and fovea） with the purpose of improving the accuracy. At last, compare the clinical optometry data from this refractor with the data obtained from optometry hospital in Wenzhou. Results The blur circle diameters are nearly the same in both reduced eye model and the Liou ＆ Brennan 1997 eye model. With the PD=4 mm and NO＇=20 mm, the refractor shows a fine accuracy in optometry. The paired t test shows that the myopia group and the astigmatism axial direction group have no statistical difference between the data from the blur circle refractor and the hospital（P〉0.05）, while the astigmatism degree group has the result of P=0.41 which may be caused by the poor cooperation of pediatric patients. 80% of the astigmatism degree data differ from the data from the hospital in less than 0.75D. Conclusion The blur circle refractor, with the features of convenience and fine accuracy, is promised to be a new style of refractometer in the future.

关 键 词：弥散斑 验光 ZEMAX 仿真 变量分析 

分 类 号：TH786[机械工程—仪器科学与技术]