I just put a Verifier Peep on my bow.
http://specialtyarch.com/verifiers.asp
I have a pair of almost 49 year old eyes, that don't focus on close objects very wellanymore. I have found the solution for shooting my bow. The Verifier is like putting reading glasses on my bow. There is a small lens that screws into a special peep. It makes the pins crystal clear again. I haven't hunted with it yet. But I shot at some targets at the archery shop tonight. It was like going from shooting shotgun sights to using a scope. My pins used to be a big blurr, now they are .019 pin heads. It does help to shoot with both eyes open but I believe it would still be a benifit to those who close one eye also.
This one is a Keeper. You over 40 guys that need reading glasses to see the newspaper, need to check this out. IT WORKS!!