Reasons for better vision in diabetes include active blood sugar control and timely treatment of retinopathy. When diabetic patients’ blood glucose rises too fast, it can make the ocular aqueous humor and lens osmotic pressure change and then cause refractive changes, which ultimately leads to blurred vision. If diabetic patients can actively follow the doctor’s instructions to take glucose-lowering drugs such as acarbose, metformin, etc., together with appropriate physical exercise, dietary control, etc. to control blood glucose in a reasonable range, reduce blood glucose fluctuations can alleviate the symptoms of blurred vision. In addition, when diabetes complicates retinopathy, vision loss can also occur. If patients with diabetic retinopathy can control their blood sugar in time at the early stage of the disease, follow the doctor’s instructions and standardize the use of medication such as calcium hydroxybenzenesulfonate, or take laser treatment, etc., vision can be restored in general. Diabetic patients who experience vision improvement should actively follow the doctor’s instructions to use medication to control their blood sugar.