About 15 years ago I remember my Dr. being very concerned that I might have a brain tumor because I kept seeing flashing white light.  I went through the whole optomologist exams and a n MIR and they couldn't find out what the problem was.  I still have them and read  in Doreen Virtue's book - Divine Guidance, what Dr.'s may not be aware of lol!

                                            Angel Lights

Angel lights come in different varieties; large, bright flashes of light; soft glowing trails of sparkles; and tiny flashes of white light.  They are sometimes captured as "orbs" in pictures.  White lights are from angels, and colored lights are from archangels.  For instance, Archangel Michael has a bluish-purple glow, Raphael casts emerald-green light, Gabriel has a coper-colored glow, and Uriel shines a very pale shade of yellow.

Angels lights are a form of Divine guidance that reassure us we're not alone, but surrounded by loving angels.  The peace that results from this realization helps us to be even more open to receiving Divine Guidance.