基于夏克-哈特曼波前检测的无透镜屈光测量系统  

Lensless Refractive Measurement System Based on Shack⁃Hartmann Wavefront Detection

作　　者：耿康杰 张贺童 丁上上 张洋[1,2] 刘敏 付威威[1,2] Geng Kangjie;Zhang Hetong;Ding Shangshang;Zhang Yang;Liu Min;Fu Weiwei(Division of Life Sciences and Medicine,School of Biomedical Engineering(Suzhou),University of Science and Technology of China,Hefei 230000,Anhui,China;Suzhou Institute of Biomedical Engineering and Technology,Chinese Academy of Sciences,Suzhou 215163,Jiangsu,China)

机构地区：[1]中国科学技术大学生物医学工程学院(苏州)生命科学与医学部,安徽合肥230000 [2]中国科学院苏州生物医学工程技术研究所,江苏苏州215163

出　　处：《中国激光》2024年第3期225-233,共9页Chinese Journal of Lasers

基　　金：山东省自然科学基金(ZR2021QE205);中国科学院青年促进会资助项目(E1290301)。

摘　　要：为了解决现有电脑验光仪和视力筛查仪体积庞大、价格昂贵的问题,设计并搭建了一套基于哈特曼波前检测原理的小型无透镜屈光测量系统。首先,对测量原理进行了详细介绍;接着,利用Zemax软件对图像采集光路进行模拟,并分析了实际测量屈光度与仪器-人眼距离的函数关系;最后,成功搭建了试验样机,并通过对中国计量科学研究院模拟眼进行屈光测量来验证函数关系的正确性及测量结果的准确性。实验结果表明该系统能有效地对-10~+10 D范围内的模拟眼进行屈光测量,测量结果显示:球镜度重复测量误差最高不超过0.20 D,变异系数不超过3%;柱镜度重复测量误差最高不超过0.25 D,变异系数不超过9%。此外,该系统结构简单且成本低廉。在满足测量结果准确性、稳定性要求的前提下,该系统更适用于需要仪器小型化的场合,具有广阔的应用前景。Objective China currently has the highest myopia rate among youth in the world,with myopia in children and adolescents becoming the leading cause of visual impairment in the country.Myopia is a progressive condition,but early detection and treatment during the pre-myopia stage can help restore vision.Currently,most children and adolescents rely on traditional computerized optometry in hospitals and ophthalmology institutions for vision screening.However,the monitoring density is insufficient to keep up with the rapid progression of myopia,and if parents notice abnormal vision in their children,they may have missed the optimal intervention period.The objective of this study is to address the issues of bulky and expensive existing computerized optometry and visionscreening instruments.We aim to provide an experimental reference for the miniaturization and instrumentation of refractive measurement systems,enabling their application in scenarios that require portability and miniaturization.Methods In this paper,we first provide a detailed introduction to the measurement principles of Shack-Hartmann wavefront sensing technology,followed by the derivation of the wavefront reconstruction algorithm principles.Human eyes with different diopters were modeled using Zemax software,and a Shack-Hartmann wavefront sensor was used to simulate the diffuse reflection phenomenon of a laser spot used as a point light source at the fovea centralis of the human eye,which is located at the center of the retina.The human eye and Shack-Hartmann wavefront sensor were placed at different distances,capturing the outgoing wavefront of the human eye at the corresponding location and imaging it on the detector.This simulated the image acquisition optical path in the refractive measurement system.The collected refractive power images were fed into the algorithm to calculate and then analyze the relationship between the actual measured refractive power and true refractive power at different distances between the human eye and Shack-Hartmann wave

关 键 词：测量 屈光测量 夏克-哈特曼波前传感器 波前重构 近视 小型化 

分 类 号：R779[医药卫生—眼科]