We are only as blind as we want to behttps://www.google.be/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=2ahUKEwjY-OTisbrZAhWxsKQKHUI0BMYQjRx6BAgAEAY&url=https%3A%2F%2Fwww.dreamstime.com%2Fstock-illustration-drawing-eye-open-closed-eyes-monochrome-vector-illustration-image75757812&psig=AOvVaw2mYxyUzSEVUPH0W5PS_OxG&ust=1519418660558219