Backgrounds: No study in Indian population have demonstrated the changes in aqueous humor glucose level with the varying degree of glycemic control as reflected in the changes in the HbA1c in rapidly corrected hyperglycemic cataract. Methods: Aqueous glucose level and HbA1c were measured of 202 cataract patients of previously undiagnosed hyperglycemia who were made normoglycemic by intensive anti diabetic medications within 7–10 days after diagnosis and were operated for cataract within 10–14 days of diagnosis. Results: Cataract patients with HbA1c of greater than 7.5% have got significantly high aqueous glucose concentration (64 ± 2.6mg/dl and above) despite having normal fasting and post prandial plasma glucose. Conclusions: Glycemic control must be ensured by monitoring HbA1c to the extent of 7.5% before proceeding for cataract surgery.