I've Got My Eyes on Higher Things

The first time they meet at Bart’s, Sherlock shakes John’s hand and asks, “Afghanistan or Iraq?”

John sputters, but answers with Afghanistan, and Sherlock ignores him in favor of talking about the flat before leaving with a whirl of his coat.

Mike smiles. “He’s always like that, yeah,” he chuckles.

John doesn’t realize Sherlock’s blind until he reads it on the man’s website that night.