A man has severe to profound deafness in one ear.His other ear is normal.Can he get the facilities 4 disabled?

26 year old Raju lives in W.B., India.His deafness in his right ear is probably caused by a mumps attack 15 years ago.He hears normally in his left ear. Is he entitled to have the facilities for the hearing handicapped(disabled)? What are the exact rules for determining the percentage and level of disability for hearing handicapped?