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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.
âVisible light (not UV radiation) causes pupil constriction, eyelid closure and squinting which can reduce penetration of the sunâs rays on a sunny day.â Jadrijevic continues by warning that, visible light is minimised on cloudy days but the exposure to harmful UV rays is still high.