The flashing sensation that occurs with a retinal detachment is caused by abnormal stimulation of the retina as it is pulled and torn. Retinal detachment may have a strong flash of light, similar to the lightning in the night sky, is due to the retina by the vitreous tissue pulling and tearing the formation of cracks caused by abnormal stimulation; in the vitreous detachment of the slight pulling stimulation may also cause a flash of light, just not as strong as when the retina detachment. Once the patient has a strong flashing sensation in the eye, he should go to the ophthalmology department of the hospital in time to do fundoscopy and ophthalmology ultrasound examination, etc., in order to clearly diagnose whether there is retinal detachment or not, if there is retinal detachment, it is necessary to reset the retina as soon as possible through surgical treatment.