Duck is hitting on a side note that is very relevant in my opinion. As maligned as WKA and AKRA have been on this forum, their existence is necessary to our sport, if for no other reason but to properly train tech inspectors. Their "calibration stickers" should be just as up-to-date as those of their tech tools.
A properly trained, qualified, certified tech inspector may have his ability to read an instrument restricted or interfered with by vision impairment, whether serious or minor..........or even temporary.