Red eye ddx

INFECTIOUS/INFLAMMATORY
  • Conjunctivitis (viral, bacterial, fungal)
  • HSV keratitis
  • Uveitis
  • Scleritis or episcleritis
  • Blepharitis, hordeolum, or chalazion
NON-INFECTIOUS
  • Acute glaucoma
  • Foreign body or corneal abrasion
  • Trauma
  • Subconjunctival hemorrhage
  • Cluster headache