Herpes simplex keratitis

• Facts:
  Frequent cause of corneal blindness in the US
  
• History / PE:
  Pain, redness in the eye
  Photophobia
  Blurred vision, tearing
• Diagnosis:
  Corneal vesicles and dendritic ulcers
  Multi-nucleated giant cells (epithelial cell scrapings)
• Treatment:
  Topical or oral antiviral therapy (eg. acyclovir )
• Associated With:
  Excessive sun exposure
  Outdoor occupation
  Immunodeficiency
• Differential Diagnosis:
  Fungal keratitis (multiple stromal abscesses)
  Bacterial keratits (contact lens wearers)
  Corneal abrasion (history of trauma, see in slit lamp)