"I am hard of seeing" or "I am hard of walking" are just never used. How did people come to call semi-deafness "hard of hearing"?
Especially, why is "hard of" used? I could understand "weak of hearing", but why "hard"?
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Interesting question. Etymonline's entry on hard explains that the phrase hard of hearing "preserves obsolete M.E. sense of having difficulty in doing something." This doesn't explain why it is only used for partial deafness. Maybe its alliteration lent it such long life.
Actually, "hard of seeing" is in use. It was coined by the late, Dr. Lorraine June Marchi Fastie. click here to read about her