Arthur is 75 years old. Hes played golf every day since his retirement 15 years ago. One day he arrives home looking downcast. Thats it, he tells his wife. Im giving up golf. My eyesight has become so bad that once I hit the ball I couldnt see where it went.
His wife sympathises and makes him a cup of tea. As they sit down she says, Why dont you take my brother with you and give it one more try.
Thats no good, sighs Arthur, your brother is 90. He cant help.
He may be 90, says the wife, but his eyesight is perfect.
So the next day Arthur heads off to the golf course with his brother-in-law. He tees up, takes a mighty swing and squints down the fairway. He turns to the brother-in-law and says, Did you see the ball?
Of course I did! Answers the brother-in-law. I have perfect eyesight.
