While flashes of light are a common sign of retinal detachment, their presence isn’t necessarily harmful. When vitreous gel within the eye tugs, bumps, or rubs against the retina, this automated traction on cells in the retina initiates a flash of light. These flashes in the eye are harmless. However, if you suddenly begin to see frequent flashes of light, see an eye doctor. Your doctor can determine if the flashes indicate you are at risk for or already have signs of a detached retina.