An individual's particular type of hearing loss is one of the major factors an audiologist considers before recommending a style and model of hearing aid.
For example, if an individual has a high frequency hearing loss with a normal low frequency response, a hearing aid that permits low frequencies to enter the ear normally while allowing only high frequencies to be amplified would be ideal. This is called selective amplification. However, if the individual with this type of hearing loss chooses a hearing aid that totally plugs the ear canal, the effect is often an artificial sound.
If an individual has a moderate to severe hearing loss in the low frequencies, almost any model of hearing aid can be adapted to the hearing loss.
As hearing changes, the hearing aid will need to be re-programmed. It is important to select a model of hearing aid the audiologist can adjust should hearing change. If you select a model that is barely within the fitting range and your hearing drops, you will have to buy a new hearing aid. The model should be appropriate for a broad range of hearing loss.