Mosquitoes or flashes of light in the eyes of these manifestations, it is recommended that you need to go to the hospital as soon as possible to do a detailed examination of the fundus, because a lot of diseases of the fundus may appear this symptom, especially in a short period of time the sudden appearance of this symptom, must be taken seriously. Retinal tear, retinal detachment, vitreous hemorrhage, all these diseases may lead to mosquito or flashing sensation in front of the eyes. After fundus examination, if these organic lesions are excluded, it is generally considered to be physiologic vitreous clouding, which is more common in middle-aged and elderly people and people with high myopia, and is a normal phenomenon that does not affect vision, so it does not need to be treated. If the symptoms are very serious and have affected normal life or study, oral lecithin complex iodine tablets or laser ablation can be considered to improve the symptoms.