<unk>  () is a branch of audiology and the science of measuring hearing acuity for variations in sound intensity and pitch and for tonal purity, involving thresholds and differing frequencies. Typically,<unk> c tests determine a subject's hearing levels with the help of an audiometer, but may also measure ability to discriminate between different sound intensities, recognize pitch, or distinguish speech from background noise. Acoustic reflex and otoacoustic emissions may also be measured. Results of<unk> c tests are used to diagnose hearing loss or diseases of the ear, and often make use of an audiogram.
Audiometry
Optometry
Photoacoustic imaging
Pure-tone audiometry
Ophthalmoscopy
Pelvimetry
Vibroacoustic stimulation
Teleophthalmology