Glad I'm not the only one.
1/2mm markings have been the bane of my life even when I could see, in fact I reckon it's the 1/2mm that have made me go blind [ pass me white stick ]
My ideal rule is one with full mm on the top and full mm on the bottom because sometimes you use the top scale and other times the bottom. I can easily judge a 1/2 mm if I need to [ one end of the white stick has been specially sharpened ].
I very rarely use an imperial rule but again they are a miss match of anything from 1/100th's, 50th's 1/64, 1/10 to furlongs perches and poles.
Try buying a rule marked ALL in 1/10's with a sub division for 50 thou. You can get them, or could. Deb's showed me one she brought back from the States but don't think they are common in this country.
Answer ?
I make my own and put on it what I want.