Random color blobs when blinking?

I have great vision, I can see the smallest of things from great distances, notice intricate details on almost anything, and catch smallest movements even in near complete darkness. There's one thing that bugs me though, sometimes I will blink and I randomly see a blob with random color(s) and it usually tints of everything it covers. It doesn't do it to my entire vision, only a small portion of what I'm seeing like earlier: There was a box in the middle of my sight. It went from blue outline and green in the middle to all purple, then all pink, and disappeared. The instances only last for a minute or two, but it's kind of freaky. Anyone know why?