Originally Posted by kramus

I have one short-sighted, strong eye and one far-sighted, weak eye. I never got glasses till I was 18. So my brain never learned how to synthesize the images into a 3D view of the world. Which explains why I can only catch frisbees, and that I regularly see things that either aren't there, or are more solid to others than to me. I see images within images because both eyes send separate signals which (especially when I'm tired) superimpose upon one another and cause ghosting.