I am near, I am far
I am big, I am small
I can't see nor can I talk.
In your eyes I reside and affect your feeble mind.
Watch closely and then step back, did you miss me?
I'm not behind your back
What am I?
Edit: The riddle has an accepted answer but as some people pointed out the riddle might be a bit too broad.
Here are additional lines to help narrow the riddle possible solution:
I'm not in abstract but am one
I am not real but can think of as inside one
Love the art in all colors and shapes.
I am a rule of time and space
Please I beg help me back inside the Frame.