Hi, I have been having these flashing ring of lights for quite some years now. The eye doctor i saw told me they were optical migraines. They will last for up to 20 minutes then i would have a pain in my temple for a short time afterwards.
i am now 46 years old and i have only had about 10 episodes all told but they really disrupt your eyesight. I can see straight ahead but nothing on the side of my vision.
Hope this helps
Phil, Do not delay in seeing the doctor. Those are the exact symptoms I had and was diagnosed with a PVD, which could lead to a tear, which could lead to a retinal detachment.I was rechecked in a month. It may be benign as Dr Prince said. But if is isn't, the time factor is very important.
you need to go to an eye doctor and have a dilated fundus/retinal exam. you might have retinal/vitreal traction.
(you might also be experiencing something benign like ocular migraine, but no one will know until someone looks)