Because I need glasses for reading (far vision is excellent) I am currently using the 1/4" hooded peep with a #5 verifier. This sharpens my pins and the target remains fairly clear. In bright light prior to installation of this system, the red pin looked about 3x its size and blurred. The #6 verifier was just too strong and blurred the target.
I guess the best thing to do is to go to a shop that carries these items and see what works best. Also suggest you try it in a low light condition