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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.
1 If the eye is too short, light is not focused by the time it reaches the retina. 2  This causes farsightedness or hyperopia. 3  Curvature of the cornea. 4  If the cornea is not perfectly spherical, then the image is refracted or focused irregularly to create a condition called astigmatism.