斜向照明便携式无散瞳眼底相机成像及定性深度分析

N. Kaushik, Takashi Sasaki, Kana Takeyama, K. Hane, T. Nakazawa
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引用次数: 0

摘要

摘要视神经的摄影评估是评估青光眼患者的原始和最广泛使用的方法之一。视网膜眼底视盘深度评估对青光眼的早期发现具有重要意义。传统眼底相机对视网膜及其周边区域的成像视野有限。在这篇文章中,我们报道了一种非散瞳宽视场眼底相机的设计和制造,该相机采用非接触式经巩膜照明,能够使用斜照明拍摄视盘的3D图像。我们证明,通过巩膜斜照射,可以获得视盘及其阴影的准3D图像。阴影提供了视盘形状和深度的重要信息。本文提出的方法使用阴影长度测量得到的视盘深度值与使用光学相干层析成像装置得到的值很好地一致。结果表明,我们的眼底相机可以成为一种易于操作和低成本的工具,可以在不需要眼科医生的情况下远程检测和诊断眼部疾病。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Imaging and qualitative depth analysis with a portable nonmydriatic fundus camera using oblique illumination
Abstract. The photographic assessment of the optic nerve has been one of the original and most extensively used methods to evaluate patients for glaucoma. The depth evaluation of the optic disc in the retinal fundus is important for the early detection of glaucoma. Conventional fundus cameras have a limited field-of-view for imaging of the retina and its peripheral areas. In this article, we report the design and fabrication of a non-mydriatic wide-field fundus camera using a contact-free trans-scleral illumination that is capable of taking 3D images of the optic disc using oblique illumination. We demonstrate that, using oblique illumination through sclera, a quasi 3D image of the optic disc along with its shadow can be obtained. The shadow provides important information on the shape and depth of the optic disc. The depth values of the optic disc obtained by our proposed method using shadow length measurements are in good agreement with the values obtained using an optical coherence tomography device. The results indicate that our fabricated fundus camera could be an easy-to-handle and low-cost tool for remote detection and diagnosis of ocular diseases without the need of an ophthalmologist.
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