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Flashes and Floaters
Seeing an occasional flash in one eye is common, especially at night.   Likewise it is common to notice a floating shadow in the vision of one eye.  However, a series of bright flashes of light that people describe as a lightening storm followed by the onset of new heavy black floaters can be the sign of the development of a hole in the retina leading to a retinal detachment.  If these symptoms occur, you should have a dilated retinal exam specifically looking for tears or holes in the retina, since the holes or tears can lead to a retinal detachment.