Aim-To assess the prevalence of diabetic retinopathy and the visual impairm
ent caused by it in an urban population in southern India in order to deter
mine its public health significance.
Methods-2522 subjects (85.4% of those eligible), a representative sample of
the population of Hyderabad city in southern India, underwent interview an
d detailed dilated eye examination during 1996-7 as part of the Andhra Prad
esh Eye Disease Study.
Results-124 subjects, all greater than or equal to 30 years old, reported t
hat they had diabetes, an age-sex adjusted prevalence of 7.82% (95% confide
nce interval (CI) 5.76-9.88%) in this age group. Diabetes was diagnosed at
age greater than or equal to 30 years in all but two subjects. The duration
since diagnosis of diabetes was <10 years in 75.6% and greater than or equ
al to 15 years in 6.7%. Diabetic retinopathy was present in 28 subjects, 1.
78% (95% CI 1.09-2.48%) of those greater than or equal to 30 years old. Mos
t of the diabetic retinopathy was of the mild (50%) or moderate (39.3%) non
-proliferative type; one subject (3.6%) had proliferative retinopathy. Mult
iple logistic regression revealed that the odds of having diabetic retinopa
thy were significantly higher in those greater than or equal to 50 years th
an in those 30-49 years old (odds ratio 7.78, 95% CI 2.92-20.73). Three sub
jects had visual impairment between 6/12 and 6/38 in either eye due to diab
etic retinopathy, 0.19% (95% CI 0-0.41%) of those greater than or equal to
30 years old.
Conclusion-Visual impairment due to diabetic retinopathy was relatively unc
ommon in this urban Indian population in 1996-7, However, this could change
in the near future with an increase in duration of diabetes because of the
anticipated aging of India's population and the recent suggestion of incre
ase in diabetes prevalence in urban India, and therefore should be monitore
d.