The man in the picture is a professional fighter who has a “Bad Eye” on the left.
What is meant by the term “Bad Eye” is that even though the man has two clearly visible eyes that appear to be fine, the fighter behaves as if one of his eyes is not working properly. In this case it is the left eye that is “bad”.
Watch how the fighter moves his body and head in the following video. The exact way his movements are performed should give the viewer the feeling that his left eye is “not part of his body”.