B pupils appear normal at baseline as afferents from non-affected eye are functional
Affected pupil w/impaired or absent repsonse to direct light
Unaffected pupil constricts normally to direct light
Swinging flashlight test→ light shined in normal eye→ pupil constricts normally
Swing flashlight to abnormal pupil→ gives appearance of affected pupil dilating in response to direct light→ swing back to normal eye and that pupil constricts