29th April 2024

A 35-year-old woman presents with a sudden, painful loss of vision in her right eye.

A 35-year-old woman presents with a sudden, painful loss of vision in her right eye. The pain is exacerbated by eye movement. She has no significant past medical history but mentions a recent episode of tingling sensations in her arms and legs that resolved spontaneously. On examination, her visual acuity in the right eye is significantly reduced. The swinging flashlight test reveals a relative afferent pupillary defect in the right eye. 

Which is the most likely diagnosis?