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What would cause a temporary flashing light in one eye?

I am female, 50, 40lbs overweight but have been very healthy. I have not had any major health concerns.
You definitely need to see a doctor about this issue. Flashing lights in the eye can be a sign of several medical problems, some of which can be very serious. I would recommend that you see both your primary care doctor and also an eye doctor. Your primary care doctor will evaluate you for underlying over all medical problems which could be causing your symptoms. Principally, these will include migraine headaches, which can often manifest as flashing lights in the eye, and any signs of a more serious neurological problem. Your eye doctor, on the other hand, will be able to evaluate you for any problems related specifically to the eye. These could include elevated pressure inside the chambers of the eye, known as glaucoma, as well as any evidence of tears in or damage to the retina. In order to rule out all of these possibilities, your eye doctor will probably want to perform a full dilated eye exam, which involves putting some drops in your eye to dilate the pupil so that they can get a good look all the way to the back of your eye. Start by making these two doctor appointments as soon as possible.
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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