Nothing, just discounting the value of the network ads we buy to the value of what is really seen. There is no solution as it client side and you cannot force them to see your ad
Move on and work with the 85% (or less) that can see your ads and that you could get a click thru from. There are very few websites that have no competition so as to afford excluding people using an ad blocker -- that just would lower the traffic counts they use to sell ads. Pissing in the wind -- get over it. It's a lose-lose scenario and a fool's battle