Bilateral red eyes

Painful

1. Caustic Keratoconjunctivitis
2. Foreign body
3. Trauma
4. Contact Lens
5. Conjunctivitis
6. Blepharitis
7. Allergic reaction
8. Thyroid disease
   1. gross chemosis, diplopia
9. Carotico-cavernous fistula
   1. fistula between carotid and cavernous sinus presents with bilateral conjunctival edema and pulsatile exophthalmos (spontaneous in elderly, secondary to trauma in young)

Painless

1. Conjunctivitis
2. Blepharitis
3. Allergic Reaction
4. Thyroid disease (optic nerve compression/APD)

See Also

• Eye Algorithm (Main)
• Red Eye (Unilateral)

References

Adapted from Pani