Close your eyes too tight,
you see nothing.

Close them halfway,
too little is seen.

Open them a little too large,
too much light and your eyes will hurt,

Open them so large your eyeballs pop out,
and you see nothing.

Only when opened at a casual look,
open just enough,
will you see what needs to be seen.

Do not wish to see more than what is given to you.
Maybe was meant to not be seen.