Prediabetes occurs when blood sugar levels are higher than normal and can be extremely harmful to eyesight. Prediabetes and diabetes affects vision because it can impair the health of the retina. The retina consists of millions of light-sensitive cells that convert light into electrical signals. These messages are sent to the brain in order to understand the images you see. Retina requires blood from small blood vessels that can be damaged by high blood sugar. Depending on the stage of diabetes, this can cause blurry vision, eye pain or redness, floating shapes in your field of vision, and even blindness.
Retinal imaging is used to screen for pre-diabetes and diabetic retinopathy. Depending on the results of the test, doctors may advise follow-up appointments and/or treatment options.