It's rare to see a player hit in the forehead like he was on Fri. I've suspected for years his eyesight's deteriorating. He often drops chest marks, too. Also, his leading is not what it should be, and that might be because he lacks clear perception of depth and distance when the ball's 70m-odd away. The onset of myopia can be so gradual and insidious that the victim is unaware of the disability. It's only when the vision is corrected(contact lenses or, more radically, laser surgery),that the sufferer realises how poor his eyesight was before the correction.