A 52-year-old executive complains to her family physician of blurred vision. Examination reveals she is unable to adduct her left eye when looking right. She also is unable to adduct her right eye when looking to the left. Medial rectus function in her left and right eyes appears normal as she focuses on near targets. Which of the following most accurately explains her condition?
A) Compression of the left oculomotor nerve B) A lesion in the abducens nucleus C) Bilateral internuclear ophthalmoplegia D) Convergence insufficiency E) Impaired smooth pursuit