I have seen these.

Sometimes I'm really stressed and trying to deal with what's going on in my head. I sit down, do the relaxed breathing exercises and totally clear my mind. Anything that tries to come to my thought I push down, and just breathe and try and not be.

That's when I see those flashes and lights. It's like they are stars really going past me. Usually, I experience flashes of images that I don't understand. Pictures and images, and I'm not sure what they are. There have been times that I've experienced very vivid images that were almost prophetic to what was going on in my life and what I was looking for an answer for.

Forgive me if that sounds too "deep" but I did want to answer you honestly. I have experienced those flashes of light and stars.