Design of portable fundus camera system based on mobile phone

Chunlei Xing; Feng Xu; Fei Lu; Guobing Tian; Mingyang Shang

doi:10.1117/12.2506700

18 January 2019 Design of portable fundus camera system based on mobile phone

Chunlei Xing, Feng Xu, Fei Lu, Guobing Tian, Mingyang Shang

Proceedings Volume 10839, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test, Measurement Technology, and Equipment; 108391K (2019) https://doi.org/10.1117/12.2506700
Event: Ninth International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT2018), 2018, Chengdu, China

Abstract

In order to meet the increasing demand for the diagnosis of household medical eye fundus, the design of a new fundus camera is proposed. The entire structure includes the imaging system and the lighting system. The optical imaging system, modeled on the Kepler telescope, matches the exit pupil of the human eye and the entrance pupil of the mobile phone camera. Thus, this system uses a mobile camera lens that owns more than 5 million pixels to take a picture of a clear fundus. A new type of fundus camera is designed with the field of 40°, the working distance of 30mm and the full length of 138 mm. The value of MTF outweighs 0.5 at the central field of view. The lighting system takes advantage of the Kohler illumination. The stray light of the reflection of corneal is effectively suppressed by adding an annular aperture on the optical path. The inner diameter of the annular light spot formed at the cornea was larger than 4mm, the outer diameter was less than 6mm, and the diameter of the evenly illuminated fundus area was 12mm.

Citation Download Citation

Chunlei Xing, Feng Xu, Fei Lu, Guobing Tian, and Mingyang Shang "Design of portable fundus camera system based on mobile phone", Proc. SPIE 10839, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test, Measurement Technology, and Equipment, 108391K (18 January 2019); https://doi.org/10.1117/12.2506700

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KEYWORDS

Imaging systems

Cameras

Light sources and illumination

Cell phones

Cornea

Eye

Stray light

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