Q10 - Corneal Infections

Question 1

Bacterial keratitis

Answer 1

• Staph, strept, pseudomonas, moraxella.

- Pain, photophobia, blurred vision, corneal ulcers, hypopyon and posterior synechiae.

Question 2

Viral keratitis

Answer 2

• HSV, VZV or adenoviruses.
  A) HSV -> blepharitis or conjunctivitis in primary infection. Can affect different layers of cornea: Dendritic keratitis (epithelium), Stromal keratitis, Endothelial keratitis (can cause sec. glaucoma) or Acute retinal necrosis syndrome. Acyclovir!
  B) Herpes zoster keratitis (similar to HSV).

Question 3

Fungal keratitis

Answer 3

• Aspergillus or Candida.

- white stromal infiltrate, satellite lesions, hyphae in corneal stroma, and hypopyon.

Question 4

Exposure keratitis

Answer 4

• Inflamm of cornea because of dryness due to incomplete closure of eyelids. Ex in facial nerve palsy, exophthalmos of Graves or after surgery.

Question 5

Photokeratitis

Answer 5

• Inflamm of cornea due to intense UV light exposure (snowblindness, welders eye).