A famous example of a deaf/blind person is https://en.wikipedia.org/wiki/Helen_Keller - this article contains some explanations about how she was able to learn to communicate with the world.
Toxin will kill you through shield and shield gating (I think Hildryn with overshields is the exception), so if you are relying on shield gating + invis to survive then you will just need to avoid toxin damage.
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