Version October 2024
| Acuity | Foreign-body sensation | Photophobia | Discharge | Cardinal feature | Treat/refer | |
| Lids/lashes | ||||||
| Stye/hordeolum | Normal | – | – | None | Tender | Treat |
| Chalazion | Normal | – | – | None | Nontender | Treat |
| Blepharitis | Normal | – | – | Dry crusting | Chronic | Treat |
| Conjunctiva | ||||||
| Conjunctivitis | ||||||
| Normal | – | – | Mucopurulent | Discharge all day | Treat |
| Normal | – | – | Mucoserous | None/URI | Treat |
| Normal | – | – | Mucoserous | Itching | Treat |
| Normal | – | – | Watery | ||
| Episcleritis | Normal | – | – | None | Sectoral injection, dull ache | Treat |
| Subconjunctival hemorrhage | Normal | – | – | None | Extravasated blood | Treat |
| Cornea | ||||||
| Abrasion | Normal or decreased | + | + | Watery | History/trauma defect revealed by fluorescein | Treat |
| Contact lens overwear | Normal or decreased | + | + | Watery | History | Treat |
| Foreign body | Normal or decreased | + | + | Mucoserous | History/trauma | Treat initially by attempt to remove by irrigation or swab; refer if still present after 24 hours |
| Infectious keratitis | ||||||
| Normal or decreased | + | + | Muco-purulent | White spot on cornea spots stains with fluorescein | Emergency referral (same day) |
| Normal or decreased | + | + | Watery | Gray, branching opacity dendrite; dendrite revealed with fluorescein | Urgent referral (1 to 2 days) |
| Anterior chamber/iris | ||||||
| Iritis | Normal or decreased | – | + | None/watery | Ciliary flush, very small pupil | Urgent referral (1 to 2 days) |
| Hyphema | Normal or decreased | – | +/– | None/watery | RBC "level" | Emergency referral (same day) |
| Hypopyon | Normal or decreased | – | +/– | None/purulent | WBC "level" | Emergency referral (same day) |
| Iris/lens | ||||||
| Angle closure | Normal or decreased | – | +/– | None/watery | Fixed, mid-dilated pupil | Emergency referral (same day) |
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