My sister had an anyeurism 15 years ago. It damaged her vision. Her left eye can only see high to the right.
She plays the piano everyday and that was something she missed doing, but it also may have been good therapy when she started to play again. She plays better now than before it happened but has said a few times in the past that she still senses a lingering feeling that something did happen to her mind. We're both over sixty-five so maybe it's partly old age.