What are the different manifestations of sudden blindness?
Retinal artery occlusion, stroke, eye trauma, fundus hemorrhage and other diseases may lead to sudden blindness.
Blindness caused by retinal artery occlusion may have these characteristics: some may be sudden and complete blindness without even light perception; However, some may appear before complete blindness, with one eye turning black temporarily and vision recovering after a few seconds or minutes. 
Sudden blindness caused by stroke may be loss of vision on one side or both eyes, as well as headache, vomiting, rotation of seeing things, skewed mouth angle, etc. 
Suddenly blind, what should I do?
1. Go to the hospital immediately or call 120
Whether it is sudden blindness after eyeball injury or sudden blindness caused by non-trauma, you should go to the hospital immediately or call 120 directly.
In addition, be on guard against transient blackening. This situation may last for a few seconds or disappear after a few minutes. If it occurs repeatedly, you must go to the hospital’s ophthalmology department immediately. Transient blindness is probably caused by retinal artery occlusion. The earlier the disease is treated, the better the effect will be. If the treatment is late, permanent blindness may be caused. 
2. Treatment of blindness caused by eyeball trauma
(1) Cover your eyes with a clean metal blindfold or paper cup, or a clean towel.
(2) Pay attention to [three don’t] when covering your eyes: don’t press your eyes hard, just cover them; Do not remove intraocular foreign bodies; Don’t touch your eyes.
How to avoid sudden blindness?
The key to preventing sudden blindness lies in preventing diseases that lead to blindness, such as retinal artery occlusion, stroke, eyeball trauma and fundus hemorrhage.
(1) Control chronic diseases
People with hypertension and diabetes are more likely to suffer from retinal artery occlusion and stroke.
(2) Regular physical examination
Early detection of potential diseases and early intervention.