I know. My eyes suck, and most my current guns are too hard to mount optics on. Generally with open sights I can't hit much past about 3-400 yards, and only if it's big enough for me to see...
I have an AR30 in 300 Win Mag with a 32x scope on it. Its dead accurate to about 300 meters, but going out to 450+ meters I'm have difficulty getting the holdover right for milk jug sized targets.