65-year-old Zhang Da-ma has suffered a significant loss of vision in the last half a month or so. During the ophthalmology examination at the hospital, the doctor found that there were some microaneurysms and small hemorrhages in her retina, which were suspected to be diabetic fundopathy. The doctor asked her if she had diabetes and she said no. The doctor tested her blood sugar and found that her blood sugar was much higher than the normal standard. Finally, a consultation with an internist confirmed the diagnosis of diabetes. Auntie Li could never have imagined that an eye examination would reveal diabetes. By examining the eyes, the following common systemic diseases can be detected or diagnosed: 1. Anemia Pale conjunctiva of the eyelids and pale color of the blood in the blood vessels. 2. 2. Hyperthyroidism Outward protrusion of the eyeballs or retraction of the eyelids. 3. Hepatitis Acute jaundice hepatitis or other diseases that can cause bile duct obstruction, the patient’s sclera color will be changed from white to yellow. 4. 4. Congenital diseases Congenital abnormalities of copper metabolism cause brain lesions with blue-green rings of copper deposits on the edge of the cornea. 5. Hypertension and arteriosclerosis, retinal blood vessels become thin, reflective enhancement, arteries and veins at the intersection of the veins may appear to be arterial compression of the manifestations of the veins. In the late stage of hypertension, fundus hemorrhage, retinal detachment and optic papillae edema can also occur. 6. Hyperlipidemia Most patients after the age of 50, the edge of the cornea will appear a circle of gray-white or white ring, can be widened with age, the color becomes darker, medically referred to as the cornea old age ring. 7. Diabetes mellitus Retina microaneurysms, hemorrhage, there may be yellowish-white or white cottony exudate and neovascularization and other manifestations. 8. Certain craniocerebral diseases In patients with increased intracranial pressure caused by intracranial tumor or inflammation, the optic nerve papillae can be seen in the fundus of the eye as edema phenomenon, and the edema can be seen to subside in the chronic stage, and the optic nerve papillae are yellowish, which is the manifestation of optic nerve atrophy. 9. Brain tumor or stroke: abnormal rotation of the eyeball, deviation, drooping eyelids, or difficulty in closing the eyes.