Final answer:
The patient's symptoms are consistent with third nerve palsy, most likely caused by an aneurysm or a tumor.
Step-by-step explanation:
The patient's symptoms, including double vision, pain in the right eye, and other findings such as ptosis (drooping eyelid), inability to elevate or adduct the right eye, and right pupillary dilation, are consistent with a condition known as third nerve palsy. This condition occurs when the third cranial nerve, which controls eye movements, is damaged. In this case, the most likely cause is an aneurysm or compression of the nerve by a tumor in the cavernous sinus.