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Chin. Opt. Lett.
 Home  List of Issues    Issue 03 , Vol. 11 , 2013    10.3788/COL201311.031702

Near-infrared fundus camera based on polarization switch in stray light elimination
Haishui Ye, Zhishan Gao, Zhenyu Qin, Qianwen Wang
School of Electronic and Optoelectronic Technology, [University of Science and Technology], Nanjing 210094, China

Chin. Opt. Lett., 2013, 11(03): pp.031702

Topic:Medical optics and biotechnology
Keywords(OCIS Code): 170.0110  260.5430  220.2945  

This letter shows that the human eye fundus tissue has higher reflectivity at the near-infrared (NIR) wavelength, and that some aberrations exist at the pre-optical system from cornea to vitreous. We design a NIR fundus camera with inner focusing, which can be applied to the –10 D to 10 D range of vision and has the advantage of ensuring the stability of image when is focused. Considered as Liou’s eye aberration model, we correct the integrated aberration to ensure a 100 lp/mm resolution when we complete the assembly and calibration of the fundus camera. Kohler illumination is also applied to obtain uniform fundus illumination. Moreover, we put forward a novel method for stray light elimination based on polarization switch, which inhibits ghost image formation near the focal plane when the illumination beam is reflected by the eyepiece surface. The result shows that this method is effective in ensuring an illumination uniformity of 80%, with the advantage of simple structure and easy assembly.

Copyright: © 2003-2012 . This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Posted online:2013/2/28

Get Citation: Haishui Ye, Zhishan Gao, Zhenyu Qin, Qianwen Wang, "Near-infrared fundus camera based on polarization switch in stray light elimination," Chin. Opt. Lett. 11(03), 031702(2013)

Note: This work was supported by the National Natural Science Foundation of China (Nos. 60977008 and 60678048), the National Ministry Education Fund for Doctoral of China (No. 20103219110014), and the Chinese Academy of Sciences Key Laboratory Fund (No. 2008DP173445).


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