A diabetic retinal [eye__exam] checks for diabetic retinopathy, a condition that affects the small thin blood vessels in the retina located at the back of the eye. Your optometrist will place eye drops into your eye to open your pupils so they can more easily see the back of your eye. They may take digital images to inspect blood vessels: these full-color 3D images show the cross-section of the retina and measure retinal thickness to help your optometrist detect any fluid or blood leakage.