I’d say blind and ignorant have very different meanings.

Being blind to something means you are unable to register it, you might be searching for it but can’t find it even though it’s right in front of you, it’s a sensory thing. Even being blind to social cues is a sort of sensory thing.

Being ignorant means you can see it but, perhaps due to a lack of open mindedness, decide that it is something else or assign incorrect characteristics to it even though eg measurements have shown different things. This could be due to a lack of trust, an agenda, or something else entirely.

Both of them make it difficult for you to learn the truth, but the causes and problems you experience are different.