You know when you look at a bright light, then look away and can still see the image (even more-so if you close your eyes)?
That's what I seen, but this was triangle shapes spiraling outward in a counter clockwise direction. It started out small and lower/right of my center of vision. It seems to have grown... Probably/mostly faded as I type this post. But it was pretty intense at first! (10 minutes later - I can't see it).
This has happened 2 other times before, and that was when I was looking at an LCD monitor. One was like a zig-zag in a circle (star with many, many points?), another was either lines or squares.
The best way I can describe the colors? Click the link below. But what I could see had very sharp and defined shapes.