Same here. I have a moderate level of astigmatism which means that if I wanted to use irons I'd have to wear trifocals or progressives and look like a Bobblehead moving my head up and down rapidly while trying to align the front and rear sights with target, and I simply refuse." I find that I can often shoot just as good, "..............don't I wish. It seams with age, everything is getting farther away and out of focus. with me it's glass or nothing.
Thankfully, with an optic (traditional scope, dot, or reflex optic) I can see both target and reticle clearly...a complete win-win for me!
BTW, nice looking 12/15! I've been considering those models as well as other BSA Martini models for some time now. I peruse Simpson, LTD quite often, and there's a good chance that I looked at and considered that very same rifle
I hope you get much enjoyment out of it!