Selecting the correct hearing aid dome
Selecting the Correct Hearing Aid Domes
In order to select the correct domes for your hearing aids you need to know the Brand, the Style and the Size of the domes. For the most part hearing aid domes are brand specific and are not interchangeable. Using an incorrect dome may result in the dome coming off in your ear.
Hearing aid domes come in different styles. The four most common are open, tulip, closed and power. There are newer styles of domes known as cap domes, vented domes and sleeve domes.
Each style of dome has a purpose. The open style domes are intended to be used for people who have high frequency hearing loss and do not need amplification in the lower frequencies. These domes have numerous holes in them which lets the low frequency sound go directly in the ear bi-passing the hearing aids. The holes also serve the purpose of ventilating your ears which cuts down on the sensation that "you have your head in a bucket" when you talk or chew. On the negative side, open domes are the most prone to feedback (whistle).
Plus style domes are more occlusive than the open domes so more low frequency energy can be amplified by the hearing aids and still keep the ears somewhat "open." These domes significantly reduce the amount of feedback from hearing aids. Plus style domes were the first attempt to "close off" the ear canal with a dome to allow people with greater hearing loss to wear a more cosmetically appealing hearing instrument. Plus size domes come in one size and have a slit on either side. Not all manufacturers offer this style.
Closed style domes look more like the open except they have fewer holes in them. They serve a similar purpose to the plus style except they come in three sizes.
Power style domes are the most occlusive and are used for people with more hearing loss. They can often be used for people who have moderate to even severe loss with minimal (if any) feedback. The down side to power domes is that they stop up your ears considerably more.
The Size of the dome is also very important. Some brands use extra small, small, medium, large and extra large while others use millimeter designations. To measure the size of your dome, stand the dome on a metric ruler and measure across the base of the dome. It’s Important to remember that if the size of your dome is not right you may experience feedback or slippage.
Shown is an 8 mm closed dome.
Summary: Selecting the proper dome is important for not only comfort but for proper hearing aid function. If you are experiencing difficulty with your current domes, most people can achieve improvement in function by selecting a different type of dome. However, selecting a dome which is too different from what your hearing aids were originally set-up to use, may not work properly. Please contact us for specific needs. We are happy to help!