Have you tried a Merit Optics aperture site that fits on your glasses? Of a long eye relief " scout " scope mounted out on the forend of the barrel? Maybe this is no longer PC, but for older shooters with poor eyesight, this is the way to save your hunting and have the confidence to still place the bullet where it should go. There are also some electronic dot sights that can be used by people with failing eyesight. El Doctor makes a compact sight that uses a laser beam light to put a red dot in the " window " of the sight. Just put the sight on your target, and squeeze the trigger. They can be used on handguns, rifles, and shotguns. ( And obviously, Muzzle loading firearms.) Hell, Even the NMLRA has new rules that permit older shooters to put scopes on their guns so they can still participate. YOu should see some of the older guys shoot small groups with their handguns with scopes mounted on them.