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What does it mean if you see flashes of light?

I am a completely healthy guy in my early 20s, and maybe a month ago I started seeing flashes of light. They're only very faint and I can only see them if it's dark and I look rapidly side to side. Is this a problem? Should I see a doctor?
Seeing flashes of light that are not there should always prompt you to see a doctor because they can be a sign of a serious eye problem. The best type of physician for you to see about this is an ophthalmologist. Seeing flashes of light when you look rapidly in one direction can caused by a phenomenon called retinal detachment. This is where the back part of your eye becomes detached from the rest of the eye. It is rare, but does threaten site in the eye effected. It also normally occurs after trauma and thus, if you have recently hit your head doing something, then this is possible. Other possible causes of flashing lights are migraine headaches. This phenomenon of migraines usually don't occur without the headache portion of it, but migraines are more common than retinal detachment. Because the sign of flashing lights is a possible sign of retinal detachment, I suggest that you schedule an appointment with an ophthalmologist. The reason for this recommendation is that ophthalmologist's have special equipment in the office which can detect subtle abnormalities in your retina that other doctors would not be able to see. More than likely, your problem will end up being benign, but you should get checked out.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under ZocDoc’s Terms of Service.

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