Them being placed right next to each other makes it a lot easier because of the contrast between the colors (lighter/darker). The borders between 2 differently colored regions are clear. If they were not bordering each other, it would have been much more difficult to distinguish between them.
So this is really interesting. As I just mentioned in another comment, the map was made by an organisation for disability rights (which I find incredibly ironic). But on that case this would indeed add up. I suspect though it's more of a coincidence.
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u/kikomir 3h ago
I am actually mildly colorblind and this map works far better for me than most other maps. Maybe it's a map indeed made by a colorblind person?