An otherwise healthy 36-year-old female patient reports that she has been experiencing blurred vision despite recently increasing her eyeglass prescription. She notes that she experienced eye pain earlier in the year, but the sensation went away without treatment before she could schedule an appointment with her ophthalmologist. She also explains that lately she has found it difficult to pick things up around the house, feeling a concerning weakness in her arms. Upon examination, the patient presents with visual impairment and decreased strength in her upper extremities.