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Why would a young man see colored shapes?

My son is in his teens and has noticed on several occasions that he sees bright colored shapes floating in the air. Is this a serious problem? Should we take him to an eye doctor or maybe a neurologist? He says they are kind of throbbing and pink-green, and they look like the spot you see after looking at a bright light.
There are a few different causes of seeing bright colored spots. Seeing a spot is basically a sign that the retina of the eye (the light sensing part of the eye) is being mechanically or electrically stimulated. For example a blow to the face will often produce "flashes of light." This is because the shock actually makes the retina physically vibrate, which the brain interprets as flashes of light. In a young person of your son's age, the most likely cause of seeing flashes of light would be a migraine. Migraine is a type of headache in which blood flow in and around the brain is altered temporarily. This is usually felt as throbbing or pulsatile headache, but it is often proceeded by an "aura" which can include numerous symptoms such as nausea, dizziness--and flashes of light or wavy lines of light. Even if these flashes your son has are not subsequently followed by headache, it could still be migraine, because there is a variant of migraine called ocular migraine, which occurs just in the eye. The best step would be to have your son's eyes examined by his primary care or eye doctor just to make sure that there is nothing more serious wrong, such as trauma to the eye. If this checks out, then it is probably migraine.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
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