I think sight is determined by what we think. The Pharisees, defined as the New Testament "heat", could not see Jesus as the Messiah. Why? I think they did not want to. Because, it took away their religious say- so.  I think the reason folks cannot see Jesus today is they don't want to. They want to have the say-so in their life, even if it is wrong. Who has the say-so in your life. God or you?

Some Pharisees were standing nearby heard him asked, "Are you saying we are blind?" "If you were blind. you would not be guilty," Jesus replied. "But you remain guilty because you claim you can see."  John 9:40-41