Suggestion: Some eye diseases are fierce and can be instantly blind. The main symptoms that lead to sudden blindness of eyes are as follows: The main causes of central retinal artery embolism are arteriosclerosis and heart disease. Due to arteriosclerosis, the arterial wall thickens and the lumen narrows, and blood gradually forms thrombus in arterial blood vessels, which is unconsciously carried out. Once the central retinal artery appears thrombosis, it can lead to blindness. The preventive measures are as follows: ① If there is arteriosclerosis or heart disease, the treatment should be strengthened; ② Some people have a premonition before onset, paroxysmal blindness, and can't see clearly for a few seconds or minutes, and then naturally return to normal. If you find this phenomenon, you should seek medical advice in time; ③ In case of sudden blindness, immediately apply vasodilator, such as amyl nitrite, wrap it in a handkerchief and crush it, and immediately put it into the nose for inhalation; ④ Go to the hospital for treatment in time. When the fundus and vitreous hemorrhage are sick, I suddenly feel black and smoke in front of my eyes, and sometimes I can see black or red objects fluttering in front of my eyes. The main causes are hypertension, arteriosclerosis and diabetes. Fundus hemorrhage can occur in any part of the fundus, and if it occurs in the central part, it will lead to blindness. Acute neuritis can be caused by some pathological changes of human body, such as sinusitis, tonsillitis, gingivitis, otitis media and so on. Influenza, pneumonia, diabetes and beriberi can cause acute neuritis. Once neuritis occurs, the use of conduction is affected, leading to blindness. If you can go to the hospital in time to treat acute neuritis, your vision can be restored. The symptoms of acute glaucoma are sudden eye pain, headache, fogging, severe vision loss, white eyeball congestion, black eyeball opacity, dilated pupils and elevated intraocular pressure. The surgical treatment has a good effect, and the application of pilocarpine eye drops and oral acetanilide and glycerol also has a good effect.