Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Optical Design of a Snapshot Nonmydriatic Fundus-imaging Spectrometer Based on the Eye Model

  • Zhao, Xuehui (School of Optics and Photonics, Beijing Institute of Technology) ;
  • Chang, Jun (School of Optics and Photonics, Beijing Institute of Technology) ;
  • Zhang, Wenchao (School of Optics and Photonics, Beijing Institute of Technology) ;
  • Wang, Dajiang (Department of Ophthalmology, The Third Medical Center of Chinese PLA General Hospital) ;
  • Chen, Weilin (School of Optics and Photonics, Beijing Institute of Technology) ;
  • Cao, Jiajing (School of Optics and Photonics, Beijing Institute of Technology)
  • Received : 2021.09.08
  • Accepted : 2022.01.17
  • Published : 2022.04.25
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Abstract

Fundus images can reflect ocular diseases and systemic diseases such as glaucoma, diabetes mellitus, and hypertension. Thus, research on fundus-detection equipment is of great importance. The fundus camera has been widely used as a kind of noninvasive detection equipment. Most existing devices can only obtain two-dimensional (2D) retinal-image information, yet the fundus of the human eye also has spectral characteristics. The fundus has many pigments, and their different distributions in the eye lead to dissimilar tissue penetration for light waves, which can reflect the corresponding fundus structure. To obtain more abundant information and improve the detection level of equipment, a snapshot nonmydriatic fundus imaging spectral system, including fundus-imaging spectrometer and illumination system, is studied in this paper. The system uses a microlens array to realize snapshot technology; information can be obtained from only a single exposure. The system does not need to dilate the pupil. Hence, the operation is simple, which reduces its influence on the detected object. The system works in the visible and near-infrared bands (550-800 nm), with a volume less than 400 mm × 120 mm × 75 mm and a spectral resolution better than 6 nm.

Keywords

Acknowledgement

The authors acknowledge the ophthalmology staff from the department of ophthalmology of the Third Medical Center of Chinese PLA General Hospital for their guidance of our ophthalmology knowledge.

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