The Hamilton-Norwood scale is a way of measuring male pattern baldness. It was introduced by Dr. James Hamilton in the 1950s and later revised and updated by Dr. O’Tar Norwood in the 1970s.
There are 2 main types of balding, anterior (front) and vertex (back), as this alternate view of the Norwood scale shows a bit more clearly.
This chart of hair loss pictures is a useful tool for diagnosis (and to avoid misdiagnosis) and for describing the extent of hair loss for treatment purposes.
