I've been wearing glasses or contacts since elementary school (very nearsighted), and I'll be 58 next month. I still shoot iron sights. 100 yds a lot; 200, 300, and 400 yds a good bit, 600 yds once so far. I usually shoot at silhouettes, and most of the time I put a serious hurtin' on them. The rest of the time they were startled at least.