Ok, thanks. Recently I had an eye exam and everything was great. A couple of days ago I started seeing a tiny yellow flash of light at the top left of my left eye. I notice it more at night but that makes sense because it is dark out. It only happens 3 or 4 times a night, I think, but I am concerned. What could it be a symptom of? Is it related to my optic nerve? I am 67 years old, exercise regularly, eat well and otherwise I am in really good health. Thank you.