joan kleinman developed a form of alzheimer's disease that brought both dementia and blindness.arthur kleinman became her caregiver. >> it is love. it's about the fact that you are there. there was the deal you made when you got mared. the deal was to be there for the person, them for you. i helped her bathe, helped her dress, helped with feeding. and the feeling i had, i would say, was generally one of empowerment, to my, which was remarkable especially at the onset, that i just felt that as i learned to do the things and did them i felt a hell of a lot better. and i felt that i was really contributing. over time, though, i think it drains you emotionally and physically, and you begin to constrict your life, you are constricted as the other person really begins to disintegrate in front of you. and so my wife's dementia led to a delirium in which not only di% she not recognize me and the like but she would be at times incoherent, flailing wildly, very paranoid aboume and others because of the sense that she could not see and could not understand what was happening. >> reporter: