See Noise Reduction Rating.

Involuntary, rapid, rhythmic, back-and-forth movement of the eyes that may accompany vertigo. This is typically caused by damage to the vestibular system, or to the central nervous system.

See OtoAcoustic Emissions.

Measurement of hearing sensitivity based on predictions made from physiologic responses such as ABR. The child’s participation is not required.

A change in the acoustical properties of the ear that results from the physical presence of a hearing aid in the ear canal. The result is that the person feels like they are talking inside a barrel—natural sounds seem muffled. Some modern hearing aids can largely overcome the occlusion effect by using “open fit” ear […]

Agency responsible for administering industrial safety standards set by the Occupational Safety and Health Act in the USA. This includes safe noise levels.