Yes, it's a very common phrase.

Student or Learner
There were 22 students who were hard of hearing at NCC. Joan has worked with many of them.
Is the underlined part a natural collocation, which means have difficulty hearing.
Thanks
Jason
Yes, it's a very common phrase.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.
Note that it's a fixed phrase. You cannot, for example, be 'hard of seeing'.
Yes.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.
Hard of heart exists.