Which of the following symptoms indicates damage to Cranial Nerve IV?

Damage to Cranial Nerve IV, also known as the Trochlear nerve, primarily affects eye movement, particularly the movement of the superior oblique muscle. This muscle is responsible for rotating the eye downward and outward. Therefore, an individual with damage to this nerve would often experience symptoms such as diplopia, which is the perception of two images of a single object, and difficulty in rotating the eye up and out. This misalignment can lead to visual disturbances since the affected eye cannot coordinate its movement properly with the unaffected eye.

The other options highlight symptoms associated with different cranial nerves. Loss of taste pertains to Cranial Nerve VII (Facial), a deviated jaw suggests damage to Cranial Nerve V (Trigeminal), and symptoms like vertigo and tinnitus are linked to Cranial Nerve VIII (Vestibulocochlear). Therefore, recognizing the specific functions associated with each cranial nerve is crucial in determining the correct symptoms attributed to damage.