Maybe I am a bit late to this party, but wanted to add my experience in case it is helpful to other members with bad eyesight. I tried the Western Precision, the Lyman Globe with Lee Shaver's inserts, and a cool heavy duty smaller "+" type fixed front sight made by KNS. All of this to upgrade the stock front sights of different rifles and muzzleloaders over the past 5 years. Took all of them off.
I use contact lenses for everyday life (-9) and since I turned 50, now I also need reading glasses(+1.5). I love to shoot open sights for hunting (especially in bad weather or thick brush) and I don't compete in shooting matches. I have found it increasingly difficult to see the front post crisp enough. I can see extremely well at distances with new contact lenses. So fiber optics and thin target cross-sights in the front have not worked well for me. I have read all the posts here and believe that the globes work extremely well for people with good eyes in broad daylight. I did set up my friend's muzzleloader with the WP front globe for elk CO.
However, I found a killer set up for me: my set up is a Williams peep in the back. I like that it sits lower than the FP ones (with one of the largest apertures or a twilight bronze ring aperture) and a Skinner Express Sight brass post in the front (filed to the right height). See pictures. When it gets darker on the last 20min of the hunt I unscrew the aperture from the rear sight for a ghost ring set up and keep shots to 75yards. I only move the back sight when changing from sabots to lead conicals; I prefer simpler lines for the back sight and keep all shots inside 120 yards. I mostly deer hunt. I like the brass front because it gathers a lot of light and the flat top is very clear vs the target, also in PA we have a black bear muzzy season. Black on Black is hard to see. My 308 BLR has a red dot
but that's for the November season. LOL
I set this up to shoot 3" high at 75 yards, by "lollypop-ing" the target. So I can see what I am shooting at, it takes a bit to get accustomed but its great. Aim and shoot up to 120 yards. 77gr weighted BH209, it likes: TEZ290, MZ300 and Thor250. It has worked very well for me. I practice a bunch. Clean and dirty barrel. Gun is a Knight 50 cal.
Also learned that with the same set up and No Excuses Conicals 420gr, fiber wad and 57gr by weight of BH209, aiming at the same exact point, my point of impact at 75 yards is 7" HIGHER than the 77r w BH209 and sabots. I talked to the helpful guys at Skinner Sights and they solved my dilemma: less powder and more bullet weight hitting higher? The answer was more recoil moves my Point Of Impact higher using the heavier conicals at 75yards. Probably that wont hold true farther away due to more pronounced rainbow trajectory on heavier bullets.
I am good to go, in a couple weeks......
Happy hunting.