Video Imaging Technology: A Novel Method for Diabetic Retinopathy Screening
Objective: To evaluate the efficacy of a new imaging technique using retinal video recording and compression for diabetic retinopathy (DR) screening
Methods: A total of 200 eyes (100 participants) were captured using retinal digital videos (OIS EyeScan) and standard retinal still photography (Zeiss FF 450 plus), followed by slit lamp examination by a senior consultant ophthalmologist. Kappa statistics, sensitivity, and specificity for all the DR signs and grades were calculated with reference to slit lamp examination as reference standard. Furthermore, 36 retinal videos with good quality were further analyzed and interpreted for diagnostic accuracies at different compression levels.
Results: The mean age (± standard deviation) of participants was 52.8 ± 15.1 years, duration of diabetes was 13.7 ± 9.7 years, and mean HbA1c was 8.0 ± 1.7%. The sensitivity and specificity of video recording for detecting the presence of any DR were 93.8% and 99.2%, respectively (ophthalmologist 1), and 93.3% and 95.2%, respectively (ophthalmologist 2), with reference to slit lamp examination. In contrast, the sensitivity and specificity of retinal photography were 91.8% and 98.4%, respectively (ophthalmologist 1), and 92.1% and 96.8%, respectively (ophthalmologist 2), for detection of any DR. For video compression analysis, the retinal video of 20 MB had a sensitivity and specificity of more than 90%. Technical failure rates for retinal video recording and retinal photography were 7.0% and 5.5%, respectively.
Conclusion: Retinal video recording is a novel and effective DR screening technique. It is quick and easy to perform with minimal training for both experienced and inexperienced ophthalmic photographers. By making it easier to screen and monitor DR in the community, particularly in remote areas and developing countries, this potentially sight-threatening condition may be diagnosed earlier and treated appropriately.
KeywordsDiabetic Retinopathy Diabetic Macular Edema Slit Lamp Examination Early Treatment Diabetic Retinopathy Study Royal Perth Hospital
- 4.Early Treatment Diabetic Retinopathy Study Research Group (1991) Grading diabetic retinopathy from stereoscopic color fundus photographs – an extension of the modified Airlie house classification. ETDRS report number 10. Early Treatment Diabetic Retinopathy Study Research Group. Ophthalmology 98:786–806Google Scholar