If this isn’t your problem, and your peripheral vision is dim/obscured, or central vision is foggy, then you may be overdue for an eye exam … especially for glaucoma, cataracts, and macular degeneration.
Can’t see the peep? No problem. Don’t use one. While I find a peep an invaluable piece of equipment as another anchor reference, some folks don’t use one at all.
As another alternative, consider the alternative approach of moving the rear sight reference further from your eye. Check out this PerrysNoPeep. You can get the whole kit — or just the back half that you can use with the sight you already are familiar with and like.
But as Brian said, it would probably pay to get your eyes checked — just to make sure.
Strange things as I get older. My arms must be getting shorter — since I’m running out of arm extension before my eyes focus on the paper. I must be getting taller too — doesn’t make sense because I’m not bumping my head — but it is getting further and further to the floor. Not to mention that when I’m way down there it seems to be further to get up and require even more effort than it used to. Ergo, I must be getting taller! (:-D
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