A 45-year-old female patient comes to the office complaining of an intermittent shadow in her peripheral vision that comes and goes over the past few weeks. As a medical assistant, you are instructed to assess her field of vision before the ophthalmologist reviews her symptoms. Which technique should you employ to evaluate the integrity of the patient's peripheral vision?
Perform automated perimetry
Use the Amsler grid test
Conduct a confrontation visual field test
Assess visual acuity using a Snellen chart