Good for old eyes because the dot is at the same focal point as the target, and is more point than aim. It's meant to be quick to use but it still has to be in the right spot to find. I initially had trouble finding the dot when I first used one on a handgun years ago.

I use a red dot on a scout scope mount on a couple of my ex-mil Mausers when I'm testing for accuracy - the standard German style V open sights are too much to contend with for my old eyes.