Diabetes Care, Vol 20, Issue 7 1147-1153, Copyright © 1997 by American Diabetes Association
Incidence of blindness in relation to diabetes. A population-based study
C Trautner, A Icks, B Haastert, F Plum and M Berger
Department of Biometrics and Epidemiology, Diabetes Research Institute, Heinrich Heine University, Dusseldorf, Germany. trau@dfi.uni-duesseldorf.de
OBJECTIVE: A reduction of diabetes-related blindness was declared a primary
objective for Europe (St. Vincent Declaration). We collected data about
incidence rates of blindness in the diabetic population compared with the
nondiabetic population. Up to now, such data are scarce-even worldwide.
RESEARCH DESIGN AND METHODS: A complete list of newly registered blindness
allowance recipients was drawn up in the district of
Wurttemberg-Hohenzollern, Germany, between 1990 and 1993. From these data,
we estimated age-specific and standardized incidence rates of blindness in
the entire, the diabetic, and the nondiabetic population, as well as
relative and attributable risks due to diabetes. RESULTS: There were 2,714
people meeting the inclusion criteria; 1,823 (67.2%) were female and 781
(28.8%) had diabetes. In 318 subjects, diabetes was likely to be the only
cause of blindness; in 192 subjects, it was one of several contributory
causes. Age of women was 73.9 +/- 19.4 years (mean +/- SD) and of men 63.3
+/- 25.5 years. Results standardized to the (West) German population are as
follows: incidence rates (per 100,000 person-years): total population:
13.5; diabetic population: 60.6; nondiabetic population: 11.6; relative
risk: 5.2; attributable risk among exposed: 0.81; and population
attributable risk: 0.14. The relative risks decreased considerably with
increasing age. When the study is repeated to monitor the St. Vincent
targets, a reduction in the incidence rate of blindness in the diabetic
population by 17% will be detected with 95% power. CONCLUSIONS: Great
relative and attributable risks, especially in younger age-groups, indicate
the need for increased attention to preventive measures for microvascular
complications.