Introduction: Diabetic patients had been proved to have thicker corneas and are commonly associated with primary open-angle glaucoma. Diabetic people have two times increased chance of developing glaucoma compared with non-diabetics Aim: To study the association of central corneal thickness and the intraocular pressure in type 2 diabetic patients and to compare the same with the healthy control subjects. Materials and Methods: This case-control study was conducted with fifty proven type 2 diabetic patients and healthy control. Study participants underwent slit lamp examination, fundus examination, IOP measurement with Applanation tonometer and corneal thickness with OCT. The screening laboratory tests included fasting and postprandial blood sugar and also glycated haemoglobin (HbA1C) levels. Results: Mean age of the patients was 55 in the diabetes group and 57 in the control group. Males were more in the diabetic group and an equal number in the control group. Mean IOP in the control group was 13.76 ± 1.74 and in the test group was 19.29 ± 2.38. Increase in HbA1C level showed a significant increase in intraocular pressure. Diabetic patients showed a significant increase in corneal thickness. Statistically, a significant difference was observed in the Mean comparison of all variables like HbA1C, corneal thickness and IOP between the diabetic and control group. Conclusion: Adult-onset Diabetes has been proved to be a modifiable risk factor for open-angle glaucoma, and periodic screening will help in the early diagnosis of glaucoma and avoid blindness. © 2020 Elsevier B.V., All rights reserved.