Its a good question and there are two important messages hidden
within the question. One is the occurrence of Diabetes without
overt symptoms. It is quite common and that is exactly why,
it is recommended that healthy people should screen for early
detection of Diabetes before complications occur in other
Unfortunately Diabetes is diagnosed after
approximately 5 to 7 years of its actual occurrence. Fluctuations
in the blood sugar value will have an influence on the vision.
The human lens being composed of proteinacious material will
get altered, when the blood sugar changes. A diabetic patient
should go for a new pair of lenses only after properly controlling
the blood sugar value. In this case, you may not even require
glasses since the vision was normal before the disease.
Cataract and Retinopathy are the prominent
characteristics of long standing Diabetes. All Diabetic patients
require an yearly consultation by an expert ophthalmologist