1. Conjunctivitis
   1. Viral
   2. Bacterial
   3. Allergic
   4. Irritative
   5. Sicca Syndrome
2. Trauma
3. Iritis
4. Corneal Ulcer
5. Scleritis
6. Episcleritis
7. Subconjunctival Hemorrhage
8. Pterygium (degenerative condition)
9. Periocular Abscess with conjunctivitis
10. Acute Closed Angle Glaucoma

References

1. Leibowitz HM. 2000. NEJM. 343(5):345