Of 100 patients complaining of light flashes, excluding those with rhegmatogenous retinal separation, 23% were found to have demonstrable vitreoretinal disease. Of these, 16% had retinal breaks or holes.
Morse PH, Scheie HG, Aminlari A. Light Flashes as a Clue to Retinal Disease. Arch Ophthalmol. 1974;91(3):179-180. doi:10.1001/archopht.1974.03900060187004