Abstract
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.
© 2013 Chinese Optics Letters
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