I think I was about 46-47 before I'd broke down to getting a pair of 150 readers, as I'd found my self sitting along side the road squinting to read directions on SSO's .
I'm up to 300 strength readers now,yet my d.o.t physical test I was still rating in like 20/15 in one eye and 20/20 in the other,,, now I know I can't pass that test and have been putting off taking it( cdl is suspended I'm sure, till I've addressed it)
I don't mean this to be taken in the wrong way, but I kinda noticed a distinct correlation in my degrading reading range vision and an increasing use of Viagra, as I was running a string at the time and ,,,er,,,ya! I think it's been a contributing factor
(If you don't stop,you'll go blind)