Lightning-like bright light in the eyes mostly refers to flashing sensation, which may be caused by visual fatigue, posterior vitreous detachment, retinal detachment and so on. 1. Visual fatigue: If patients watch cell phones, computers, television, etc. for a long time, do not pay attention to eye use, excessive fatigue, visual fatigue can be caused by the patient may appear in the eyes with a flash-like bright light performance, generally can be relieved after rest. 2. Posterior vitreous detachment: As the patient grows older, vitreous liquefaction occurs after detachment, and liquefaction or degeneration occurs later, if it pulls on the retina and stimulates the retinal cells, it can cause the patient to have a flash-like bright light in the eyes. 3. Retinal detachment: the patient’s eyes with lightning-like brightness may also be caused by retinal detachment, because the retinal detachment part of the retina will involve the peripheral retina, stimulate the retinal cells, so the patient may appear in front of the eyes flashes of light performance. It is recommended that patients with flashes of light in front of their eyes should consult a regular hospital in a timely manner to assess their condition and follow the doctor’s instructions for treatment.