When you are deaf, you can still use sign language, body language and writing (and even speech, unless the question assumes that you are deaf from birth), while leading an otherwise quite normal life, whereas being blind means that you pretty much lose the ability to work, read (braille  ), ever travel by yourself, et cetera; you're basically dependant on other people for the rest of your life.
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There are a lot of deaf people who don't hear the truck coming from the right, though.
There's nowhere I can't reach.