Red eye
- is a catch-all term for the inflamed or injected external appearance of the eye, for which there are many causes.
- down into 3 groups:
- extra-ocular causes
- orbital cellulitis
- cavernous sinus thrombosis
- carotid-cavernous fistula
- cluster headache
- external eye disease
- eyelid and conjunctival disease
- internal eye disease
- iritis
- glaucoma
- extra-ocular causes
- Once an extra-ocular cause is excluded:
| Painless | Painful | |||||
| Diffuse | Localised redness | Abnormal cornea | Abnormal eyelid | Diffuse conjunctival injection | Ciliary injection/ scleral involvement | Anterior chamber involvement |
| Blepharitis Ectropion Entropion Trichiasis Eyelid LesionTumour Stye | Pterygium Corneal Foreign Body w/out abrasion Ocular Trauma Subconjunctival Hemorrhage | HSV Keratitis Corneal Ulcer Marginal Keratitis Foreign body 🡪 Corneal Abrasion | Chalazion Stye Acute Blepharitis Herpes Zoster Ophthalmicus | Viral Conjunctivitis Allergic Conjunctivitis Bacterial Conjunctivitis Dry Eyes Acute Glaucoma | Scleritis | Acute Anterior Uveitis (Iritis) Hypopyon Hyphema |
