There was a time not to long ago - 15 years ago, that sunglasses were a complete no-no. I recall being instructed and seeing others chastised for wearing non-perscription lenses at a National ASA clinic. Then ball players started wearing those flip up things... then the major league umpires... now everybody wears them.
I think perhaps we have become more tolerant because we have become more aware of the deleterious effects of cumulative sunshine - prevent cataracts, wear sunglasses.
This year I've broken down and have worn sunglasses several times on the bases. I haven't ventured behind the plate with sunglasses but many times I have worn safety glasses to keep the wind and dust out of my eyes - safety glasses are a solid part of my personal protective equipment. (Foam ear plugs can be particulary beneficial for cutting the drumming wind noise on those nasty days too.)
I would still recommend that you have them OFF during your pregame meeting with the coaches and captains so you can make unimpeded eye contact during those conversations - well not if they are prescription!
