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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.
How do we see. 1. Light waves reflected from the object enter your eye. 2. accomodation occurs. 3. when retina is exposed to light rods and cones undergo chemical reaction that turns a chemical reaction into a neural signal.