How would you split the difference between those using the glasses to cheat and those using them through necessity? Should those that don't as a matter of course wear glasses be banned and those with a prescription be allowed? As a wearer of glasses I can see that removing and/or putting on glasses throughout a course could well make a difference (unfortunately not in my case) but would it be any difference to the advantage of the shooter having 20/20 vision? Having never had 20/20 vision I can't answer that question.
And where do you draw the line at removing and replacing glasses? Quite often in bad/cold weather i have to take my glasses off just to be able to take a shot within the 2minutes due to condensation, rain, mud, etc...would it be seen that I've taken them off to gain a possible advantage? I'll be very interested to see how this one pans out