Final answer:
Visual field by confrontation is a method to test peripheral vision by establishing the boundaries of visibility without moving the eyes. It involves an examiner holding their hands out to the sides and asking the patient when their fingers are no longer visible.
Step-by-step explanation:
Performing visual field by confrontation is a method used to test the extent of peripheral vision. It involves an examiner holding their hands out to the sides and asking the patient when their fingers are no longer visible without moving their eyes to track them. This test helps establish the boundaries of peripheral vision. If necessary, further tests can be conducted to assess perceptions in the visual fields.