Interesting point jmoore. A search online shows almost no mention of "anti-bloomed lens/es", quite a few mentions of "anti-bloom" and many mentions of "bloomed lenses". The question is I suppose is it a coating to improve light transmission or a coating to inhibit "bloom", which is light diffusion as you mentioned. Perhaps there is some ambiguity there in the terminology as it has developed over time. We'd have to know what the purpose of the coating was in each case to know which term was correct I suppose.