Not having a visual reference would mean their experience of visual input would be distinct from ours, but concluding that it doesn’t happen at all is a stretch.

It literally would...

Because of the type of blindness they're talking about...

You don't understand anything else, because you're still trying to talk about any sort of visual impairment

I'm sorry I can not explain this in a way you can understand, but I've also lost all motivation to try with anything else at this point.

You'll need to find someone else