What are ocular manifestations of nasopharyngeal carcinoma?

Ocular lesions in nasopharyngeal carcinoma are generally related to the eye, thus causing ocular complications. Invasion of the optic nerve can lead to vision loss. The oculomotor nerve controls the muscles responsible for stabilizing the eyeball; when invaded, it results in restricted eye movement and diplopia (double vision). The trochlear nerve governs certain eye movements, and its invasion leads to impaired eye motility. Invasion of the trigeminal nerve may cause ptosis (drooping eyelid) and facial numbness.