Schepens Eye Research Institute, Mass Eye & Ear; Department of Ophthalmology, Harvard Medical School;
Schepens Eye Research Institute, Mass Eye & Ear.
J Vis Exp. 2024 Oct 18(212). doi: 10.3791/67506.
To improve access to vision care and to enable mass vision screening, a smartphone app has been developed to measure refractive errors. Without needing any external attachment, the app running on a standalone phone can be used by lay personnel to measure subjective refraction. Its validity has been pilot-tested in clinical settings and underserved communities. The app estimates the refractive error by measuring the distances of far points for discerning visual stimuli. Spherical equivalent refraction and astigmatism can be measured using Tumbling E letters and grating patterns, respectively. The purpose of this paper is to describe the measurement protocols for performing subjective refraction using the app. Experimental results with 34 subjects (30 eyes for spherical equivalent and 38 eyes for astigmatism assessment) are presented. Measurement with the app was compared with standard clinical methods. The average absolute error of spherical equivalent refraction was 0.63D, and the average absolute error of astigmatism measurement was 0.28D. In addition, 22 subjects were enrolled to evaluate inter-pupillary distance (IPD) measurement with the app. The average absolute error in IPD measurement with the app was 1.2 mm. The protocol for measuring IPD with the app is also described.
为了改善视力保健的可及性并实现大规模视力筛查，我们开发了一款智能手机应用程序来测量屈光不正。该应用程序无需任何外部附件，可由非专业人员在独立的手机上使用来进行主观屈光测量。其有效性已在临床环境和服务不足的社区中进行了试点测试。该应用程序通过测量辨别视觉刺激的远距点来估计屈光误差。通过使用 Tumbling E 字母和光栅图案，可以分别测量球镜等效屈光度和散光。本文旨在描述使用该应用程序进行主观屈光测量的测量协议。对 34 名受试者（30 只眼睛用于球镜等效评估，38 只眼睛用于散光评估）进行了实验，结果如下。将应用程序的测量结果与标准临床方法进行了比较。球镜等效屈光度的平均绝对误差为 0.63D，散光测量的平均绝对误差为 0.28D。此外，有 22 名受试者被招募来评估应用程序的瞳距（IPD）测量。应用程序测量 IPD 的平均绝对误差为 1.2 毫米。还描述了使用应用程序测量 IPD 的协议。
