Technical an common language often intersect in logically confusing ways.
Blindness is on the greater vision spectrum but not all of the vision spectrum is the blindness spectrum. At a point on the vision spectrum one stops being blind and becomes sighted. Think of it like light. Ultraviolet is on the light spectrum and has a spectrum of its own; but not all of the light spectrum is ultraviolet.
Technical an common language often intersect in logically confusing ways.
Blindness is on the greater vision spectrum but not all of the vision spectrum is the blindness spectrum. At a point on the vision spectrum one stops being blind and becomes sighted. Think of it like light. Ultraviolet is on the light spectrum and has a spectrum of its own; but not all of the light spectrum is ultraviolet.