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.
Vision yes, blindness no.
Vision is the opposite of blindness, no?
Surely if the spectrum exists for one it must exist for the other?
0 becomes 100 and 100 becomes zero
0% blind is perfect vision, 100% blind is no vision
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.