How Should Ambient Vision Be Examined

How should ambient vision be examined?

A) Instruct the patient while in a sitting position to visually track from right to left with increasing speed.
B) Instruct the patient to read a Snellen eye chart from a distance of 20 feet.
C) Instruct the patient to move across the busy gym area while observing ability to navigate safely,avoiding obstacles.
D) Instruct the patient to look at the therapist's nose while the therapist slowly brings a pencil into the patient's field of view from the right or left.