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Proceedings Paper

Comparison of low-cost handheld retinal camera and traditional table top retinal camera in the detection of retinal features indicating a risk of cardiovascular disease
Author(s): V. Joshi; J. Wigdahl; S. Nemeth; G. Zamora; E. Ebrahim; P. Soliz
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Paper Abstract

Retinal abnormalities associated with hypertensive retinopathy are useful in assessing the risk of cardiovascular disease, heart failure, and stroke. Assessing these risks as part of primary care can lead to a decrease in the incidence of cardiovascular disease-related deaths. Primary care is a resource limited setting where low cost retinal cameras may bring needed help without compromising care. We compared a low-cost handheld retinal camera to a traditional table top retinal camera on their optical characteristics and performance to detect hypertensive retinopathy. A retrospective dataset of N=40 subjects (28 with hypertensive retinopathy, 12 controls) was used from a clinical study conducted at a primary care clinic in Texas. Non-mydriatic retinal fundus images were acquired using a Pictor Plus hand held camera (Volk Optical Inc.) and a Canon CR1-Mark II tabletop camera (Canon USA) during the same encounter. The images from each camera were graded by a licensed optometrist according to the universally accepted Keith-Wagener-Barker Hypertensive Retinopathy Classification System, three weeks apart to minimize memory bias. The sensitivity of the hand-held camera to detect any level of hypertensive retinopathy was 86% compared to the Canon. Insufficient photographer’s skills produced 70% of the false negative cases. The other 30% were due to the handheld camera’s insufficient spatial resolution to resolve the vascular changes such as minor A/V nicking and copper wiring, but these were associated with non-referable disease. Physician evaluation of the performance of the handheld camera indicates it is sufficient to provide high risk patients with adequate follow up and management.

Paper Details

Date Published: 13 February 2018
PDF: 6 pages
Proc. SPIE 10485, Optics and Biophotonics in Low-Resource Settings IV, 1048516 (13 February 2018); doi: 10.1117/12.2291099
Show Author Affiliations
V. Joshi, VisionQuest Biomedical LLC (United States)
J. Wigdahl, VisionQuest Biomedical LLC (United States)
S. Nemeth, VisionQuest Biomedical LLC (United States)
G. Zamora, VisionQuest Biomedical LLC (United States)
E. Ebrahim, North Central Texas Community Healthcare Ctr. (United States)
P. Soliz, VisionQuest Biomedical LLC (United States)

Published in SPIE Proceedings Vol. 10485:
Optics and Biophotonics in Low-Resource Settings IV
David Levitz; Aydogan Ozcan; David Erickson, Editor(s)

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