I can see the sights, or I can see the target
Roger that.
Out past 50 yards, that would also be me. From 30 to about 50 I'm okay, but as the distance grows so does the pixel smearing of the target (or the sight).
At Tueller distances I can do decent pistol work, but 30 yards is a real stretch for me with the pistol (yes, I will still hit the target, though there are no guarantees regarding that fuzzy bit in the middle). From thirty yards and out, I'm in carbine territory, simply for the saving grace of the long sight radius.
There was a time, many many years back, when 100 yards with irons was no big deal, and I qualified "expert" with those eyes.
I didn't take up shooting again until I was over 50 years old, and found that I'd left my eyes in another life.
All of that said, I will still make carbine hits on a 5-gallon bucket at 100 yards with iron sights. Maybe half a magazine.
So, if I were to engage a hostile at 100, I could probably keep him honest, because as blind as I am, accidents will happen.