just go over the size with a red marker..
I use red on metric and blue on us standard
my junk tools that I use on junkyard crawls..
I sprayed the wrench red or blue in the middle and then "highlighted the size marking(lettering) in the blue/red..
I don't have eye issues, but it makes it much easier to find the right one.. fast..
or go to a craft store and get the plastic tape (think electrical tape in style) that comes in like 10 colors...
or get a set of testors model paint.. and paint a 1" band on each with a different color.. mark the sockets the same and it should help.. as long as you remember what color=what size..