13th February 2025

A 28-year-old woman presents with blurred vision in her left eye for 1 week, associated with pain on eye movement.

A 28-year-old woman presents with blurred vision in her left eye for 1 week, associated with pain on eye movement. She also complains of reduced red colour vision in the affected eye. What is the most helpful diagnostic investigation?

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