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Proceedings Paper

Portable retinal imaging for eye disease screening using a consumer-grade digital camera
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Paper Abstract

The development of affordable means to image the retina is an important step toward the implementation of eye disease screening programs. In this paper we present the i-RxCam, a low-cost, hand-held, retinal camera for widespread applications such as tele-retinal screening for eye diseases like diabetic retinopathy (DR), glaucoma, and age-related ocular diseases. 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. The i-RxCam uses a Nikon D3100 digital camera body. The camera has a CMOS sensor with 14.8 million pixels. We use a 50mm focal lens that gives a retinal field of view of 45 degrees. The internal autofocus can compensate for about 2D (diopters) of focusing error. The light source is an LED produced by Philips with a linear emitting area that is transformed using a light pipe to the optimal shape at the eye pupil, an annulus. To eliminate corneal reflex we use a polarization technique in which the light passes through a nano-wire polarizer plate. This is a novel type of polarizer featuring high polarization separation (contrast ratio of more than 1000) and very large acceptance angle (>45 degrees). The i-RxCam approach will yield a significantly more economical retinal imaging device that would allow mass screening of the at-risk population.

Paper Details

Date Published: 9 March 2012
PDF: 7 pages
Proc. SPIE 8209, Ophthalmic Technologies XXII, 82091T (9 March 2012); doi: 10.1117/12.909318
Show Author Affiliations
Simon Barriga, VisionQuest Biomedical, LLC (United States)
Univ. of New Mexico (Afghanistan)
Andrey Larichev, Lomonosov Moscow State Univ. (Russian Federation)
Gilberto Zamora, Lomonosov Moscow State Univ. (Russian Federation)
Peter Soliz, VisionQuest Biomedical, LLC (United States)
Univ. of Iowa (United States)

Published in SPIE Proceedings Vol. 8209:
Ophthalmic Technologies XXII
Fabrice Manns; Per G. Söderberg; Arthur Ho, Editor(s)

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