Hearing Aid Limitations

Hearing aids and cochlear implant technologies are great and both have benefits, yet there are some limitations.

Summary Hearing Aid Limitations

With hearing aids and cochlear implants:

Hearing aids alone do not restore hearing.
Hearing aids are very useful in quieter situations and one-on-one situations (though individual hearing ability varies widely).
Effective range (for most) is under 10’ (for some < 2-3’). And some hearing loss is so severe – that understanding speech is very limited.
Hearing aid microphones pick up all background sounds

Improves signal-noise-ratio that people with hearing loss need.
- Hearing instruments increase SNR up to 6 dB.
- Remote microphones increase SNR up to 12 dB.
- Assistive listening systems increase SNR up to 30 dB.
Assistive listening systems
- Augment hearing aids.
- Works for people with and without hearing aids.
- Clarify sound by eliminating the negative effects of distance, noise, and reverberation.

Burwinkel, J., et al. “Hearing Loops and Induction Coils: Improving SNR in Public Spaces.” Hearing Review 31, no. 2 (February 2024): 22–25.
Clark, JG and B. Gilb. (March-April 2019). HAT Awareness Efficiency May Be the Key to Increased Use. Audiology Today. Volume 31 ( 2 ), p 72 – 78. “hearing assistance technologies (HATs) from their audiologist. A routine use of a HAT needs checklist can provide an efficient means to introduce beneficial products to patients and help ensure greater audibility.”
Lesica, N. (May 2018). Hearing Aids: Limitations and Opportunities. The Hearing Journal
Madell, J. (January 5, 2023). The Listening Bubble – What is it and Why Does Size Matter? Hearing Health & Technology Matters (HHTM)
Remensnyder, L. (September 2013). Used Alone, Hearing Aids Fail to Deliver. Audiology Practices. . . “All hearing aids and all CIs use microphones. The microphone is the first component followed by sound processors that are fully dependent upon microphone input. And all microphones have three annoying characteristics: they pick up what is loudest, they pick up what is closest and they have absolutely no idea which sound is important to the listener.” (pdf)
Hearing Aid Benefits and Limitations FDA.