All are tests for vestibular function EXCEPT:
**Core Concept**
Vestibular function tests assess the balance and equilibrium of the inner ear, which is crucial for maintaining posture, spatial orientation, and preventing falls. These tests evaluate the vestibular-ocular reflex (VOR), vestibulospinal reflex, and vestibulocollic reflex.
**Why the Correct Answer is Right**
The correct answer is related to the assessment of visual function, specifically the visual acuity and visual field, which are not directly related to vestibular function. The vestibular-ocular reflex (VOR) is a critical component of vestibular function, where the vestibular system in the inner ear sends signals to the brain, which then sends signals to the eye muscles to maintain eye alignment during head movements.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is not a direct test of vestibular function. However, it is related to the vestibular system, as the caloric test can stimulate the vestibular apparatus and elicit a vestibular response.
**Option B:** This option is incorrect because it is a test of auditory function, not vestibular function. Pure-tone audiometry assesses hearing loss and is not directly related to balance or equilibrium.
**Option C:** This option is incorrect because it is a test of vestibular function, specifically the vestibular-ocular reflex (VOR). The electronystagmography (ENG) test measures the electrical activity of the eye muscles during head movements, which is essential for assessing vestibular function.
**Clinical Pearl / High-Yield Fact**
The caloric test, a type of ENG, is a classic test for vestibular function, where cold or warm water is placed in the ear canal to stimulate the vestibular apparatus and elicit a vestibular response. This test is essential for diagnosing vestibular disorders such as labyrinthitis or Meniere's disease.
**Correct Answer:** B. Pure-tone audiometry.