Cats that have sensory problems tend to do better than you think.  Their
other sense just like humans hone themselves.  Introduce them normally.
Cats communicate more thru body language than voice.

PS THANK YOU FOR TAKING ON A SPECAIL NEEDS FURBALL

I have had a couple of deaf cats over the years....they were large,
keen-eyed,
and could hold their own in a tussle with their compadres. No
problems.
Blind cats are another matter. Presently we have a *half* blind huge
neutered
male whose sight in left eye has been gone since an act of cruelty
when he
was a tiny kitten...no one messes with him as he outweighs any of the
others
here. But I had a completely blind female for many years who lost her
sight in
both eyes from retinal detachment during her last couple years of long
life. She
turned very timid and hid quite a bit under beds and in corners from
the other
cats who would kinda pick on her but never really hurt her. Other than
that, as
their vet predicted, she never forgot where either the food/water
bowls were nor
the litterbox location.