Abstract
Background: The prevalence of blindness due to diabetic retinopathy have been decreasing, primarily due to improvements in diabetes care. However, there are still cases in which patients do not visit an ophthalmologist for diagnosis and treatment of diabetic retinopathy, resulting in severe visual impairment and even blindness. Because diabetic retinopathy often lacks subjective symptoms even in advanced stages, periodic fundus examinations are desirable and strongly recommended. However, many patients fail to visit an ophthalmologist for fundus examinations; and there are needs for quantitative evaluation to predict severity of diabetic retinopathy that can be used in clinical settings to encourage patients to visit an ophthalmologist.
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