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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.
They are caused when pieces of debris floating in the jelly-like substance of the vitreous humor, which fills the middle of an eyeball, cause shadows on the retina at the back of the eye.While rarely a cause for concern, they can be annoying enough for some to want to learn how to reduce floaters.hey are caused when pieces of debris floating in the jelly-like substance of the vitreous humor, which fills the middle of an eyeball, cause shadows on the retina at the back of the eye.