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Vision is caused by a chemical reaction that is triggered in the cells of the retina-rods and cones-when photons of light hit them. But these reactions, although chaotic, can also be triggered by mechanical action on the organ of vision, for example, by closing your eyes, pressing or hitting the head.
If you just close your eyes and see stars, flashes,or bright patterns — then this is a reason to consult an ophthalmologist and therapist — most likely you have hypertension with visual damage.