Evaluation of modified portable digital camera for screening of diabetic retinopathy.

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Abstract

To describe a portable wide-field noncontact digital camera for posterior segment photography.

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Telemedicine screening of diabetic retinopathy using a hand-held fundus camera.

K. Yogesan, I J Constable, C Barry … (2000)

The objective was to evaluate digital images of the retina from a handheld fundus camera (Nidek NM-100) for suitability in telemedicine screening of diabetic retinopathy. A handheld fundus camera (Nidek) and a standard fundus camera (Zeiss) were used to photograph 49 eyes from 25 consecutive patients attending our diabetic clinic. One patient had cataracts, making it impossible to get a quality image of one of the eyes (retina). The Nidek images were digitized, compressed, and stored in a Fujix DF-10M digitizer supplied with the camera. The digital images and the photographs were presented separately in a random order to three ophthalmologists. The quality of the images was ranked as good, acceptable or unacceptable for diabetic retinopathy diagnosis. The images were also evaluated for the presence of microaneurysms, blot hemorrhages, exudates, fibrous tissue, previous photocoagulation, and new vessel formation. kappa Values were computed for agreement between the photographs and digital images. Overall agreement between the photographs and digital images was poor (kappa < 0.30). On average, only 24% of the digital images were graded as being good quality and 56% as having an acceptable quality. However, 93% of the photographs were graded as good-quality images for diagnosis. The results indicate that the digital images from the handheld fundus camera may not be suitable for diagnosis of diabetic retinopathy. The images shown on the liquid crystal display (LCD) screen of the camera were of good quality. However, the images produced by the digitizer (Fujix DF-10M) attached to the camera were not as good as the images shown on the LCD screen. A better digitizing system may produce better quality images from the Nidek camera.

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Efficacy and reliability of fundus digital camera as a screening tool for diabetic retinopathy in Kuwait.

Khalid AlSabti, Seemant Raizada, Vivek B. Wani … (2003)

Many screening and follow-up methods are available for detecting diabetic retinopathy (DR). However, once patients develop retinopathy, it is unclear as to what method should be used for their review. This study is designed to assess the correlation between fundus digital image and clinical examination and to develop a screening program for the early detection of sight-threatening DR using a Canon CF 60 UV fundus camera.