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.
Whatever knowledge is, exactly, it is justified in terms of what is in our minds. And what is in our minds, Hume says, are always either impressions received through the senses, or ideas, i.e., less vivid and clear copies of these impressions that we become aware of in thinking as opposed to in sensing.