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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.
In the primary mirror of a reflecting telescope, light of different wavelengths, such as red and blue light from a star, are focused at the same point. The so-called seeing effect on the image of an astronomical source that causes twinkling of the image is produced by what effect in the Earth's atmosphere?