healthy disabled people = do not have an illness that will effect them soon and cause them to have unknown thoughts about their future in life, this inc people who suffer from thing ssuch as downsyndrome

unhealthy disabled people are the opposite

eugenics is basically human selection, so promoting breeding of people with high IQ by giving them payments/supporting them = positive eugenics

negative eugenics would be something like the USA sterilisation programme or the Nazi programme