A hearing aid is a device that people who have hearing problems use to hear more easily. Early designs of the hearing aid can be described as "ear horns," funnel shaped amplification devices that people put up to their ears whenever they needed to listen to something.
Of course, the evolution of technology made it possible for the extinction of the atrocious-looking device. Now, hearing aids are commonly electronic devices that are worn on the ear like the conventional ear phone. The first design of these had a rectangular battery pack that connected to the ear piece with a lengthy wire. The battery pack was usually placed in the user's pocket. This design tended to be flawed, as the microphone used to amplify sounds wasn't placed very strategically, often suffering disturbances from the user's clothing. During the mid 20th century, they came up with hearing aids that had a small battery inside the actual earpiece.
There are several hearing aids for you depending on your specific needs. There are the body worn hearing aids, which were introduced earlier. And then there are behind the ear (BTE) hearing aids, which are situated behind the ear with a specially made ear mold. This is convenient because it allowed the user to still use their natural hearing and at the same time it came out in a variety of colors and designs.
Following these types is the in the ear (ITE) hearing aid. You can find many of these custom made to fit the user's ear. Modern models of the ITEs have the ability to regulate and cancel feedback, a loud, screeching sound caused by sound leaking out and being amplified again.
You can also find in the canal (ITC), mid canal (MIC) and completely in the canal (CIC) types of hearing aids. ITC aids only fill the bottom half of the external ear. MIC and CIC are smaller and isn't usually visible. Use these only if you have mild to moderately severe hearing problems.
Bone anchored hearing aids (BAHA) on the other hand are aids that are surgically implanted devices that make pathways of sound out of bone.
Before there were eyeglass aids, devices that combined both hearing aids and spectacles. These were devices that were catered for those who had problems with both hearing and seeing. The hearing aids were put in the temple part of the glasses. The trouble with this was that there wasn't much of a choice for frames, and one had to wear both the glasses and the hearing aids together, or not at all.
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