MSFinals-3815
A 44-year-old man with untreated tertiary syphilis is undergoing screening for complications of neurosyphilis. During questioning, he reports experiencing a decrease in visual acuity and color vision on his left side. He denies any headaches or changes in vision when coughing.
Upon examination, there are no signs of gaze or eye movement abnormalities. However, a relative afferent pupillary defect is present, and fundoscopy reveals swelling of the optic disc on the left side. Based on this likely diagnosis, what other visual abnormality may be anticipated?