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Another common phosphene is “seeing stars,” from a sneeze, a heavy and deep cough, blowing of the nose, a blow on the head or low blood pressure (such as on standing up too quickly or prior to fainting). It is possible these involve some mechanical stimulation of the retina, but they may also involve mechanical and metabolic stimulation of neurons of the visual cortex or of other parts of the visual system
The region of the brain that controls eyesight is in the back of your head, odd as that may seem. That's also why the back of your skull is called the occipital bone.