Final answer:
The symptoms described suggest a diagnosis of internuclear ophthalmoplegia (INO), characterized by impaired horizontal eye movement and diplopia.
Step-by-step explanation:
The symptoms described in the question suggest a diagnosis of internuclear ophthalmoplegia (INO). INO is characterized by impaired horizontal eye movement, specifically the inability to adduct one eye while the other eye exhibits nystagmus when looking to the side. Diplopia (double vision) is often experienced due to the misaligned eye movements.