I just graduated from single vision to progressives this week (turned 40 last week), so I'm following this with interest. As of right now, I'm perfectly fine with just single vision distance correction for shooting glasses, as I really only have a hard time focusing very close (reading a book, phone, etc). As somebody else said, I wonder if I could get a set of progressives dialed in specifically for head/eye/hand placement for shooting? If that's possible, I might be able to hang on to irons for a few more years.