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The use of digital cameras in a mobile retinal screening environment

Taylor, DJ; Fisher, J; Jacob, J; Tooke, JE; (1999) The use of digital cameras in a mobile retinal screening environment. DIABETIC MED , 16 (8) 680 - 686.

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Aims To assess how successfully digital camera technology might be incorporated into a mobile screening environment.Methods One hundred and ninety-seven people had their fundi photographed using a Topcon/Imagenet digital system and 534 using a Canon CR5/Ris-Lite system in addition to concurrent 45 degrees CP4NM Polaroid photography. One hundred and eighteen randomly selected patients were also sent for 7 field stereo photography as a gold standard. An acceptability questionnaire was answered by a random sample of these photographedResults For the detection of any retinopathy, digital pictures had a sensitivity of 0.74 (95% confidence interval (CI) 0.68-0.80) whilst Polaroid was 0.72 (95% CI 0.66-0.78) and for referable retinopathy digital pictures had a sensitivity of 0.85 (95% CI 0.80-0.90) and Polaroid was 0.90 (95% CI 0.86-0.94). A concurrent ophthalmoscopic evaluation improved the sensitivity to 0.92 (95% CI 0.86-0.98) for detection of any retinopathy whilst the sensitivity at the referral level was improved to 0.95 (95% CI 0.91-0.99). Twenty-nine of 176 respondents experienced flash discomfort with the Polaroid system with only four of 154 describing 'some' discomfort from the digital systems which have a lower flash power (10 W vs. 300 W) and a faster recovery time.Conclusions This study indicates that digital systems are a feasible and acceptable alternative to Polaroid-based cameras for use in a mobile environment.

Type: Article
Title: The use of digital cameras in a mobile retinal screening environment
UCL classification: UCL > School of Life and Medical Sciences
URI: http://discovery.ucl.ac.uk/id/eprint/1310922
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