This is difficult for me to ask as I'm not sure how to extrapolate the term.

I'm not talking about the BSOD on a Windows Operating System.

But from a visionary perspective.

I watch movies on my laptop and the graphics on the computer turn into a slightly dark shade around the characters - Like silhouettes.

They start to appear when I lower my head.

Why does this happen?

Thank you all.

It is much appreciated.