• threeonefour@piefed.ca
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    2 days ago

    No. Blindness is also a spectrum but not everyone is blind. There is a range of normal vision and someone is only blind if they fall outside of that range. However, two people who are deemed blind can have varying degrees of blindness and need varying degrees of assistance.

    • __siru__@discuss.tchncs.de
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      2 days ago

      Although it would probably be fitting to describe it as a subset. If you look at vision, then it is a spectrum that includes everyone. Even blind people. If you are looking at blindness, then it is a subset of the vision spectrum that only includes people that meet certain other criteria, i.e. below a certain threshold of vision. Same for autism disorder. Every human is on a mentality spectrum, and autism is a subset of that.

    • oxomoxo@lemmy.world
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      2 days ago

      This is a pretty decent comparison. Not everyone can have ASD because then it can’t be classified as a disorder. There is a threshold for being diagnosed just as with vision impairment. Those who are diagnosed are on a spectrum from least debilitating to most.

    • 9point6@lemmy.world
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      2 days ago

      Surely vision is a spectrum with everyone on it.

      One end “better than 20-20” on the other “only darkness”

        • 9point6@lemmy.world
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          2 days ago

          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

          • ninja@lemmy.world
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            1 day ago

            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.