User blog comment:Haki73/Zoros eye?/@comment-202.156.11.12-20120111102522

If anything, its just Zoro giving himself a handicap. By removing the whole depth perception, he relies on his senses to fight rather than his visual sight. My guess is that he shut it permanently so that when the time comes to fight Mihawk, he'll fight with all his senses. My second guess is that he's going to be forced to open his eye after he gets beaten down by someone incredibly strong, and then kick his ass.