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These sparkles that you are seeing are called phosphenes. These little flashes of light are caused by pressure put on the optic nerve and are generally harmless. They can occur from changes in blood pressure, such as if you stand up quick. They can also occur from a blow to the head, a sneeze or a bout of coughing.

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Q: When you strainght yourself or when you are tired and do something harsh you sometimes see little sparkles all over you What is this and why is it happening?
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