1st April 2022

A 20-year-old female presents with visual blurring and eye pain

A 20-year-old female presents with visual blurring and eye pain. She notices that her symptoms get worse when she exercises or takes a hot bath. She is otherwise fit and well apart from an episode of one-week right arm weakness which spontaneously resolved 3 months ago. 

Which of the following is the most appropriate investigation?

Select the SINGLE most appropriate option from the list below. Select ONE option only.