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The sharp light is a result of some physical stimulus on the retina , the light sensitive part at the back of the eye(rather like the screen of a projector). Generally , it is advisable to consult an eye doctor to make sure there's no problems(eg retinal detachment) when one gets a knock or a trauma to the head or eye.Often, a retinal detachment (or torn retina) will give rise to such 'bright lights' or sometimes known as a 'lightning effect'

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14y ago
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Q: What is it when you hit the back of your head and then see sharp bright light out of the corner of your eye for about 30minutes?
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