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. 2020 Jul 29;8(7):e17480. doi: 10.2196/17480

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©Maximilian W M Wintergerst, Linus G Jansen, Frank G Holz, Robert P Finger. Originally published in JMIR mHealth and uHealth (http://mhealth.jmir.org), 29.07.2020.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIR mHealth and uHealth, is properly cited. The complete bibliographic information, a link to the original publication on http://mhealth.jmir.org/, as well as this copyright and license information must be included.

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Optical setup of the smartphone-based funduscopy device evaluated in this study. The (A) smartphone-based fundus imaging device (iC2 funduscope; HEINE Optotechnik GmbH & Co. KG) evaluated in this study has a separate optical path for the illumination system and the imaging system. (B) Optical paths in the plane of the pupil (I=illumination’s light path, II=imaging system’s light path) with approximate scale. (C) The optical setup consists of four aspheric lenses and a polarized illumination source with a 3000-K light-emitting diode. The device allows for a field-of-view of up to 34 °. Lens 3 is adjustable for compensations of refractions up to ±15 D.