Watching the mouth of a person speaking as a method to help a hard of hearing person understand what they are saying. (The modern term is speechreading.)

A hearing aid that amplifies sound by a set amount (e. g. 20%, 50%, etc.) at any particular pitch; regardless of the initial volume. This can result in soft sounds not being amplified enough to be heard, and loud sounds being amplified so that they are much too loud. Most older hearing aids had linear […]

Audiogram showing measurable hearing only at the frequencies of 125, 250 and 500 Hz. Thresholds are usually above 70 dB.

See Loudness Discomfort Level.

A genetic condition where the vestibular aqueduct is larger than normal. The result is that many people with enlarged vestibular aqueducts suffer from hearing loss from head trauma or from rapid changes in pressure. For a more in-depth understanding of Large Vestibular Aqueduct Syndrome, read this article.

See Vestibular Labyrinth and Vestibular System.