The premise of the OP is not about partially sighted people. "Legally blind" covers a huge range of optical conditions. My father is legally blind, but his coke-bottle trifocals mean he can see as well as I can.

Which means, despite being legally blind, he aint blind.

And tactile perception has nothing to do with deafness at all, so I mean... irrelevant. If you can use a different sense to see with, lemme know.