Review Question - QID 214269

A 25-year-old woman presents to the emergency department with severe left-sided retro-orbital pain. Her pain has progressively worsened over the course of 2 days and worsens with eye movement. She reports a loss of central vision and says that colors seem "washed out." She states that she has never experienced this before. Physical examination is notable for visual acuity of 20/200 in the left eye and 20/30 in the right eye. Fundoscopy examination shows a normal fundus. Both of her pupils are equal and reactive to light; however, when light is swung from the right eye to the left eye, both pupils dilate. Which of the following is the most appropriate next step in management?