Here are the most commonly used terms for the different styles of hearing aids. You can click on a specific type to jump to its pros and cons.
Completely in the canal - (CIC)
Canal aid, or in the canal - (ITC or CA)
Full shell, or in the ear - (ITE)
Behind the ear - (BTE) sometimes called post auricular
Eyeglass hearing aids - (EG)
Body aids
Those at the top of the list are normally the smallest, and the newest in the history of development of the hearing aid. Here are some of the advantages and disadvantages of each style:
Advantages:
- Small and discreet for cosmetic purposes
- Efficient in delivery of high frequencies. (Outer ear collects and focuses high frequency sound waves to the opening of the ear canal).
- You may be able to use a telephone or headsets normally, because the aid is recessed in the ear.
- Sound can be reproduced without driving the speaker into distortion, as speaker is near the eardrum
Disadvantages:
- Usually most expensive instrument because of small size.
- Usually too small to having a volume control that can be used while in the ear.
- Not appropriate for severe to profound hearing losses. (Not enough power without having feedback)
- Not appropriate for high frequency (ski-slope) type hearing loss. (Too much occlusion)
- Not suggested for children, as their ears grow too fast.
- Difficult to use and operate for persons with dexterity or eyesight problems. (Small size and battery)
- CIC hearing aids have the highest repair rate compared to other hearing aid types.
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Advantages:
- All of the advantages of the CIC above, although slightly larger.
- Can have options such as volume control and multiple memories.
- Can have a larger vent opening than a CIC.
- Can utilize more advanced circuitry because of more room for components.
Disadvantages:
- Less expensive than CIC, but more expensive than larger aids
- Can fit more types of hearing loss than CIC, but still not as severe of loss as larger aids
- Better than CIC for persons with dexterity problems, but still fairly small
- Higher repair rate than ITE or BTE
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Advantages:
- Has better retention in ear since it can lock in place in the outer ear.
- Room for a large vent, to reduce occlusion.
- Room for advanced circuitry and circuit options
- Easier to handle and adjust
- Usually less expensive the canal aid or CIC
Disadvantages:
- ITEs are in the ear, but they can be seen easier than the ITC and CIC
- Higher repair rate than BTE, because of wax getting into speaker.
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Advantages:
- The hearing aid fits over and behind the ear, so there is a great amount of flexibility as to what size or type of earmold fits in the ear or ear canal.
- Earmolds can be made of hard or soft materials, can be modified or changed at will and for less expense that remaking the shell of a an in the ear type aid.
- Can be used for severe and profound hearing losses, as the microphone is further from ear canal and feedback is less likely.
- They are sometimes less expensive than in the ear type aids
- More options can be selected, such as connections for assistive listening devices, and more recently, attachments for blue tooth technology
- Wide selection of case colors can be used to blend with hair color.
- Larger controls and battery sizes are available
Disadvantages:
- Some people find having a hearing aid that must go both in their ear (the mold) and behind their ear (the aid) to be cumbersome and difficult to put on and use.
- BTEs are more visible for those without much hair
- BTEs can be more inconvenient for physically active people
- BTEs are more susceptible to moisture and perspiration damage
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Eyeglass hearing aids are generally no longer available. If a manufacturer can be found, it would be difficult to find someone who knows how to install and adjust them correctly to the frames.
Advantages:
- Highest power available, for severe and profound losses
- Feedback is less of a problem because of the separation of the microphone and speaker
Disadvantages:
- Inconvenience of a cord going from the body aid in your pocket or under your clothes to the ear
- Clothes noise and wind noise
- Less choice and technology is available since the number of units sold do not support new research and development
- Background noise problems
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If you are considering the purchase of a hearing aid, use the criteria above to narrow your choice to two or three possibilities, then discuss the options with you hearing professional to select which would make the most sense for you.
