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Diabetic Retinopathy^1,2

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SCREENING FOR DIABETIC RETINOPATHY

Diabetic retinopathy is a highly specific vascular complication of both type 1 and type 2 diabetes. The prevalence of retinopathy is strongly related to the duration of diabetes. After 20 years of diabetes, nearly all patients with type 1 diabetes and >60% of patients with type 2 diabetes have some degree of retinopathy. Diabetic retinopathy poses a serious threat to vision. In the Wisconsin Epidemiologic Study of Diabetic Retinopathy (WESDR), 3.6% of younger-onset patients (aged <30 years at diagnosis, an operational definition of type 1 diabetes) and 1.6% of older-onset patients (aged 30 years at diagnosis, an operational definition of type 2 diabetes) were legally blind. In the younger-onset group, 86% of blindness was attributable to diabetic retinopathy. In the older-onset group, where other eye diseases were common, one-third of the cases of legal blindness were due to diabetic retinopathy. Overall, diabetic retinopathy is estimated to be the most frequent cause of new cases of blindness among adults aged 20–74 years.

The recommendations in this paper are based on the technical review on the subject,1 which should be consulted for further information.

NATURAL HISTORY OF DIABETIC RETINOPATHY

Screening strategies depend on the rates of appearance and progression of diabetic retinopathy and on risk factors that alter these rates. Vision-threatening retinopathy virtually never appears in type 1 patients in the first 3–5 years of diabetes or before puberty. Over the subsequent 2 decades, nearly all type 1 patients develop retinopathy. Up to 21% of patients with type 2 diabetes have recently been found to have retinopathy at the time of first diagnosis of diabetes, and most develop some degree of retinopathy over subsequent decades.

In general, the progression of retinopathy is orderly, advancing from mild nonproliferative abnormalities, characterized by increased vascular permeability, to moderate and severe nonproliferative diabetic retinopathy (NPDR), characterized by vascular closure, to . . . [Full Text of this Article]

EFFICACY OF LASER PHOTOCOAGULATION SURGERY

COST-EFFECTIVENESS OF SCREENING FOR RETINOPATHY

SUMMARY AND RECOMMENDATIONS

GUIDELINES

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