Which of the following describes tympanometry?

Tympanometry is a diagnostic procedure that specifically measures the movement of the tympanic membrane, commonly known as the eardrum. This test helps to assess the status of the middle ear by evaluating how well the eardrum moves in response to changes in air pressure. A healthy tympanic membrane will respond appropriately to the pressure changes, indicating normal functioning of the middle ear system.

The procedure can reveal various conditions affecting the middle ear, such as fluid in the ear, eustachian tube dysfunction, or ear infections, which might be affecting sound transmission. By focusing on the mobility of the tympanic membrane, tympanometry provides valuable insights into hearing mechanisms that other tests may not address directly.

Other options describe different audiological or visual testing methods, which do not pertain to tympanometry. For instance, recording sound wave frequencies relates more to audiometry, detecting visual field loss pertains to visual acuity assessments, and testing hearing through air conduction involves different audiometric techniques focused on understanding overall hearing ability. Therefore, the unique focus of tympanometry on the tympanic membrane's movement makes it distinct and essential in the assessment of middle ear health.