Keratitis

Question 1

Layers of the cornea

Answer 1

1. Epithelium (several layers thick - can regenerate after injury without scarring)
2. Bowman’s layer (does not regenerate - scars with damage)
3. Stroma (thickest part - scars with damage)
4. Descemet’s membrane (BM - regenerates after injury)
5. Endothelium - does not regenerate - opacifies when damaged

Question 2

Keratitis - clinical presentation

Answer 2

Eye pain
Conjunctival injection
Decreased/blurry vision
Watery discharge 
Photophobia 
Foreign body sensation

Question 3

Bacterial keratitis - most common organisms

Answer 3

• Staph aureus
• Pseudomonas aeruginosa
• Coagulase-negative staph
• Pneumococcus
• Often polymicrobial