[Influence of lasting diabetes and non-adjustable glycosylated haemoglobin on occurrence of retinopathy].
The aim of this study was to investigate the effect of the duration of diabetes and glycemia on the development of diabetic retinopathy in diabetes types 1 and 2 and the prevalence of retinopathy by sex. It examined 278 diabetics in 1999 and 2004, a questionnaire was used to collect data and results of fasting glucose, HbA1c, glycosuria and ketonurie were recorded. Retinopathy was noted in 80 (28.78%) and 187 (67.27%) patients during 1999 and 2004, respectively (p < 0.001). The number of patients with the nonproliferative and preproliferative (p < 0.001) as well as with proliferative retinopathy (p < 0.01) was significantly higher in 2004 in the comparision with 1999. The average HbA1c in 1999 was 13.02%, whereas in 2004 it was 10.57%. Poor control of diabetes was present during both investigations.