Certified Ophthalmic Medical Technologist (COMT)

Answer: B - In a relative afferent pupillary defect, the pupil dilates when a bright light is swung from the unaffected eye to the affected eye.

A relative afferent pupillary deficit known as the Marcus Gunn pupil shows a diminished pupillary response to light in the affected eye. Due to the reduced ability to respond to light, light directed into the affected eye will only induce a slight contraction of both pupils. In contrast, light into the unaffected eye will cause both pupils to constrict.