Thank you. I do need correction to see the target at all, particularly at rifle ranges, because I've been nearsighted since at least junior high school. I suppose that once I get bifocals or progressive lenses (probably at my next eye exam), I'll need to learn to find the target first through the long-distance part of the lens, then shift to the near-distance part to focus the sights on the correct blur. I haven't gone shooting since I started to notice the onset of farsightedness, but I can still see well enough at front sight distance without correction. But now I need magnifying glasses to focus on small things like PCB features up close, which is pretty annoying. It's not just that the PCB features are getting smaller I've begun playing around with vintage computers recently, and I even have trouble focusing on the old through-hole stuff now without external optics.