Conjunctivitis

Causes

Appropriate Tests

Chemical injury/foreign body

Pathology tests not appropriate.

Infection

For persistent or recurrent infection: Conjunctival swab/fluid - microscopy and culture for bacteria, Chlamydia, Virus detection and culture.

See also Keratoconjunctivitis.

Viral infection, especially

  • Adenovirus

PCR of conjunctival swab

Bacterial infection, especially

  • Streptococcus pneumoniae
  • Haemophilus influenzae
  • Staphylococcus aureus
  • Neisseria gonorrhoeae

MCS of conjunctival swab

Other infection

  • Chlamydia trachomatis
  • Candida albicans

 

Allergy

If indicated: conjunctival smear - microscopy (for eosinophils), Skin prick allergen testing, Allergen specific Immunoglobulin E if skin prick tests are contraindicated or unavailable.

Vernal

The diagnosis is based on the clinical appearance of the lesions; biopsy is only indicated if the diagnosis is unclear.