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So whether there is light entering the eye or not, any stimulation of the retina will be translated into a light show by the brain. If you see stars or flashes after sneezing, it could be from a pressure on the eye itself, or from stimulation of the nerves that have to do with sight.
When the vitreous separates from the retina, you may see flashing lights once in a while, for a few weeks. If you see jagged lines of light that last 10 to 20 minutes and happen in one or both eyes, this is probably a migraine caused by the spasm of blood vessels in the brain.