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Cornea & External Diseases




















Bacterial keratitis demonstrating epithelial ulceration and conjunctival injection.

  • Sight-threatening infection.
  • Clinical features:
    • Present as an acute, rapidly progressive corneal destructive process or a chronic process.
    • Predisposing factors include: corneal epithelial disruption caused by trauma, contact lens wear, contaminated ocular medications and impaired immune defense mechanisms.
    • Symptoms: foreign body sensation, ocular pain, conjunctival injection, photophobia, tearing and decreased vision.
    • Signs: initial ulceration may progress to stromal infiltrate, stromal abcess formation and necrosis or anterior segment inflammation.
    • May be complicated with intraocular infection.
  • Causative organisms include gram-positive cocci (Staphyloccocus sp. Streptococcus pneumoniae), aerobic gram-negative bacilli (Pseudomonas aerugenosa, Haemophilus influenzae, Moraxella catarrhalis.), enteric gram-negative bacilli or colonization of normal skin flora (Staphylococcus aureus, Streptococcus viridans).
  • Work up:
    • Corneal scrapings for stains and cultures. Consider additional studies to rule out fungal, Acanthamoeba or mycobacterial infections if suspected.
    • Antimicrobial susceptibility testing.
    • May culture the eyelid and conjunctiva, ophthalmic medication bottles or tubes, contact lenses, contact lens cases and solutions.
  • Management:
    • Broad-spectrum topical antibiotic therapy.
    • Fortified subconjunctival or IV antibiotic are indicated if infection does not respond to initial treatment.
    • Cycloplegia.
    • Topical corticosteroids may be used to prevent scarring.
    • Therapeutic surgical penetrating keratoplasty is indicated when corneal perforation occurs.

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