Blackout is a common symptom of ophthalmology, referring to the sudden and dramatic loss of vision and darkening of both eyes. Many eye diseases can cause the appearance of blackout, and it is important to identify the specific causes that lead to targeted treatment, and the common causes are the following: First, due to Leber’s disease. It is possible for the vision to recover naturally a few months to a few years after the onset of the disease. The current treatment is mainly through the use of Idebenone, Coenzyme Q10 and the point of Unoprostone isopropyl drops to shorten the course of the disease and promote the recovery of vision. Second, due to the embolism of the central retinal artery, it usually develops in one eye, and the treatment needs to be rescued in a hurry by giving oxygen, blood vessel dilation, thrombolysis, and lowering intraocular pressure in order to restore the vision. Third, due to vitreous hemorrhage, oral lecithin complex iodine can be given to promote the absorption of the hemorrhage in the early stage of the disease, and patients who cannot be absorbed can be treated by surgery.