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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.
Eye floaters result when something besides light from the environment stimulates the retina, which is the light-sensing structure at the back of the eye. This stimulation causes the retina to send a signal to the brain. The brain may interpret the signal as an apparent object floating in the field of vision (floater) or as a simple, sudden flash of light that can look like lightning, spots, or stars (photopsia). Photopsias can occur when the eyes are rubbed.