The effect of diabetes on the eyes is that it may lead to retinopathy, cataracts, paralysis of the eye muscles, which in turn may lead to impaired vision. Diabetic patients with a long duration of illness or chronic poor blood glucose control are prone to damage to the blood vessels of the retina due to chronically high blood glucose levels, which may lead to hemorrhage, tortuosity, and occlusion of the blood vessels of the retina, or even lead to the development of microangiomas. Due to the development of retinopathy, patients may experience vision impairment such as decreased visual acuity, visual field defects, or even blindness. Poor control of blood sugar may also cause metabolic cataracts, and may also involve the nerves, leading to motor nerve palsy and even strabismus. The initial symptoms of eye diseases caused by diabetes are not obvious and easily overlooked, and they are often more serious when discovered. It is recommended that diabetic patients actively cooperate with their doctors for treatment, ensure that their blood glucose levels are in a stable state, and undergo regular vision tests.