For about 3-4 days i've been getting intermittent flashes of light in my peripheral vision. it's like someone took my picture, but no source. i have n?

Eye doctor to check: Seeing flashes of light in one eye, when there is no reason to see flashes of light, may be a symptom of retinal detachment (which means the inner lining of the eyeball is coming loose). That means one should see an ophthalmologist now (retinal detachment is a medical emergency). One can go to the Emergency Room if she has no eye doctor, and the E.R. can call the ophthalmologist on-call if needed.