About Deaf-Blindness > What is Deaf-Blindness. Deaf-blindness is a low incidence disability and within this very small group of children there is great variability. Many children who are deaf-blind have some usable vision and/or hearing. The majority of children who are deaf-blind also have additional physical, medical and/or cognitive problems.
Introduction-David Hume. The Philosopher David Hume is famous for making us realize that until we know the Necessary Connection / cause of things then all human knowledge is uncertain, merely a habit of thinking based upon repeated observation (induction), and which depends upon the future being like the past.
The Scientific Method. Everyone is entitled to his own opinion, but not his own facts.. -- Daniel Patrick Moynihan (1927-2003), United States Senator from New York. Facts do not cease to exist because they are ignored.. --Aldous Huxley. When the facts change, I change my mind.