Ocular Trauma Triage & Initial Assessment

Emergent vs. Urgent Referral

Not every ocular injury needs to be seen the same hour, but a few findings absolutely do. A relative afferent pupillary defect (RAPD) discovered after trauma is one of them — it points to asymmetric optic nerve or severe retinal dysfunction and demands same-day, emergent evaluation rather than next-day urgent referral. It's also a genuinely prognostic finding, not just a triage trigger: an RAPD after trauma correlates with the severity of posterior segment or optic nerve injury and helps predict visual outcome.

By contrast, a corneal abrasion with photophobia and tearing, a small hyphema filling less than 10% of the anterior chamber, or an eyelid laceration that spares the lid margin can typically be managed on an urgent (within 24 hours) rather than emergent basis. The distinction matters practically — it's what determines whether a patient goes straight to the emergency department's on-call ophthalmologist or is scheduled into next-day clinic.

The Initial Exam — What to Do and What to Avoid

Visual acuity, pupillary exam, and a careful external/lid inspection are all safe and should be performed on essentially every trauma patient. Visual acuity testing itself sometimes needs to be adapted to the patient in front of you — an Illiterate E chart, where the patient simply indicates which direction the "E" is pointing, is useful for patients who can't identify letters because of illiteracy or a language barrier, without sacrificing a quantitative acuity measurement.

Comparing pupil size, shape, and light reactivity between the two eyes is one of the highest-yield parts of the initial exam: beyond screening for the RAPD discussed above, the pupil's shape itself can be diagnostic. A teardrop-shaped or peaked pupil is a classic sign of occult open globe injury — it forms when iris tissue is pulled toward and incarcerated in a corneal or scleral wound, and its presence should prompt immediate protective measures and imaging even if no obvious laceration is visible.

What you should not do once an open globe is suspected is just as important. Tonometry (measuring intraocular pressure) and any exam maneuver that applies pressure to the globe risk extruding intraocular contents through an open wound and must be avoided until rupture has been excluded. Patching the eye firmly is similarly contraindicated — a firm patch can transmit pressure onto an open globe the same way a probing finger would. The correct initial protective measure is a rigid shield (a "Fox shield" or similar) placed over, not touching, the eye — it protects against external pressure and extrusion without compressing the globe itself, and should stay in place through transfer to definitive ophthalmologic care.

A high-velocity, metal-on-metal mechanism — the classic example being a construction or machine-shop worker hammering metal on metal — deserves special suspicion even when the visible wound looks small. A small corneal wound paired with an irregular pupil in that setting is strongly suggestive of an intraocular foreign body (IOFB) with an open globe, and warrants emergent imaging and surgical evaluation rather than reassurance from the wound's modest size. When an IOFB is suspected, CT of the orbits is the preferred initial imaging study — it localizes foreign bodies and orbital fractures quickly and, critically, doesn't risk magnetically displacing a ferromagnetic fragment the way MRI can. A fluorescein-based Seidel test — looking for a dark stream of diluted dye within the pooled bright-green fluorescein under cobalt blue light — can confirm active aqueous leakage from a full-thickness corneal or scleral wound when the diagnosis is in doubt.

One more finding to actively screen for on the initial exam: proptosis, tense lids, decreased vision, and an RAPD together suggest retrobulbar hemorrhage causing orbital compartment syndrome — a true surgical emergency. Recognizing this constellation on first assessment is what prompts immediate lateral canthotomy and cantholysis, which releases the lateral canthal tendon to decompress the orbit and restore perfusion to the optic nerve before permanent ischemic damage sets in. This is not a "refer and wait" finding — it's treated at the bedside.

Chemical Injury: The One True "Treat Before You Assess"

Chemical ocular injuries are the exception to "examine first, treat second." Alkali agents — lye, ammonia, and similar substances — penetrate tissue rapidly through saponification, causing progressive damage that continues for as long as the chemical is in contact with the eye. Because of this, immediate copious irrigation takes priority over triage documentation, history-taking, or formal visual acuity testing. Every additional minute of ongoing exposure adds tissue damage, so irrigation should begin before, not after, the rest of the trauma work-up.

Mass Casualty Triage

When ophthalmic resources are constrained — a mass casualty event, an overwhelmed emergency department — triage has to rank injuries by both reversibility and urgency. An open globe injury with exposed uveal tissue is prioritized above a resolving corneal abrasion, stable periorbital contusion swelling, or a healed subconjunctival hemorrhage, because exposed intraocular contents carry the highest risk of infection and permanent vision loss of any of those presentations. The underlying logic is the same one that drives the emergent-referral criteria above: injuries that are actively progressing toward irreversible damage get seen first, ahead of injuries that are already stable or self-resolving.

Pediatric Trauma and Non-Accidental Injury

Ocular trauma in a child carries an additional triage responsibility that adult trauma doesn't: recognizing when the history doesn't fit the injury. When a pediatric patient presents with suspected ocular trauma and the history from caregivers is inconsistent, a referral to child protective services (or an equivalent abuse-evaluation pathway) becomes mandatory alongside the ophthalmology referral — not an optional add-on. This should happen concurrently with, not after, ophthalmic management; an inconsistent history in this setting is itself a clinical finding that needs its own referral pathway.

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