I have this problem from 10 - 12 year ago. ask many doctors but can't satisfy. Yesterday i test for audiometry test , there  i found right is ok and left is positive.one ear can't listen any beep at any frequency.... doctor told me to there is no way to treat this , you have to wear hearing ad... i ask for any surgery then they said if there bone and tumor problem then we done...and also said that one surgery is there but there is no guarantee because in your case this is from vanes problem. so i want to know is there any way to treat this problem 100 % guarantee or i have to wear hearing aid...?