Only thing I have shot with open sights in many many years have been a couple of Elephant at VERY close range and one of those I shot high and missed a brain shot. I have worn glasses since about 5 years old and even with them in these late years I don't see too well. And wearing trifocals I have a very difficult time with Irons getting everything in reasonable focus. I do like the red dots though and they are remarkably good. Would they really be considered 'open sights'?