Portable, low-priced retinal imager for eye disease screening

Peter Soliz; Sheila Nemeth; Richard VanNess; E. Simon Barriga; Gilberto Zamora

doi:10.1117/12.2042815

28 February 2014 Portable, low-priced retinal imager for eye disease screening

Peter Soliz, Sheila Nemeth, Richard VanNess, E. Simon Barriga, Gilberto Zamora

Proceedings Volume 8930, Ophthalmic Technologies XXIV; 89300J (2014) https://doi.org/10.1117/12.2042815
Event: SPIE BiOS, 2014, San Francisco, California, United States

Abstract

The objective of this project was to develop and demonstrate a portable, low-priced, easy to use non-mydriatic retinal camera for eye disease screening in underserved urban and rural locations. Existing portable retinal imagers do not meet the requirements of a low-cost camera with sufficient technical capabilities (field of view, image quality, portability, battery power, and ease-of-use) to be distributed widely to low volume clinics, such as the offices of single primary care physicians serving rural communities or other economically stressed healthcare facilities. Our approach for Smart i-Rx is based primarily on a significant departure from current generations of desktop and hand-held commercial retinal cameras as well as those under development. Our techniques include: 1) Exclusive use of off-the-shelf components; 2) Integration of retinal imaging device into low-cost, high utility camera mount and chin rest; 3) Unique optical and illumination designed for small form factor; and 4) Exploitation of autofocus technology built into present digital SLR recreational cameras; and 5) Integration of a polarization technique to avoid the corneal reflex. In a prospective study, 41 out of 44 diabetics were imaged successfully. No imaging was attempted on three of the subjects due to noticeably small pupils (less than 2mm). The images were of sufficient quality to detect abnormalities related to diabetic retinopathy, such as microaneurysms and exudates. These images were compared with ones taken non-mydriatically with a Canon CR-1 Mark II camera. No cases identified as having DR by expert retinal graders were missed in the Smart i-Rx images.

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Peter Soliz, Sheila Nemeth, Richard VanNess, E. Simon Barriga, and Gilberto Zamora "Portable, low-priced retinal imager for eye disease screening", Proc. SPIE 8930, Ophthalmic Technologies XXIV, 89300J (28 February 2014); https://doi.org/10.1117/12.2042815

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KEYWORDS

Cameras

Image quality

Eye

Imaging systems

Retina

Digital cameras

Photography

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