Optic neuritis

• Facts:
  Typically presents in people aged 20-45 years old
  Females are more commonly affected
  
• History / PE:
  Afferent pupillary defect, with central scotoma
  Changes in color perception
  Decreased visual acuity
  Pain on eye movement
  Rapid impairment in vision in one, or both, eyes
  
• Diagnosis:
  Swollen disc (fundoscopy)
• Associated With:
  Multiple sclerosis
  Drugs (eg. ethambutol, hydroxychloroquine )
• Differential Diagnosis:
  Anterior uveitis
  Orbital cellulitis
  Open angle glaucoma (gradual vision loss)
  Episcleritis