Abstract

The purpose of this study was to evaluate prediabetic patients for microvascular changes using optical coherence tomography-angiography (OCT-A) and compare with diabetic patients and healthy controls. OCT-A images of 60 eyes of 30 patients with diabetes mellitus (DM), 72 eyes of 36 prediabetic patients, and 108 eyes of 54 healthy controls were retrospectively evaluated and compared in this study. A swept-source OCTA (Triton, Topcon) instrument was used for collecting OCT-A images. Duration of the diabetic or prediabetic period, glycated hemoglobin, fasting blood glucose level, postprandial glucose (PPG) level, high-density lipoprotein, low-density lipoprotein, triglyceride, and creatinine values of all participants were recorded. Microaneurysm, nonperfusion areas, perifoveal capillary disruption, and capillary network disorganization were detected in both prediabetics and diabetics but statistically more common in diabetic patients. Neovascularization and intraretinal microvascular anomalies were detected only in diabetic patients. OCT-A seemed to be effective in detecting microvascular changes in diabetic patients. More importantly, results showed us that in prediabetic patients, microvascular changes can be seen before the onset of DM and before or concurrently with neurodegenerative changes.

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