Helen Keller has been quoted as saying that blindness separates you from things, but deafness separates you from people. While noise in the workplace usually does not produce the profound deafness that Helen Keller had, it can contribute to permanent hearing loss. As the quality of hearing aids has improved immensely over the years, people with mild to moderate hearing loss can often expect significant benefit from them. However, hearing aids usually do not improve hearing as effectively as glasses correct vision.