Emergency Triage for the CPO Exam

Patient ServicesEmergencyTriageCPO

Triage in the ophthalmic practice means quickly assessing the urgency of a patient's complaint and ensuring that sight-threatening conditions receive immediate attention. As a CPO, you are often the first clinical staff member to interact with a patient reporting an eye problem. Correct triage can be the difference between saving and losing a patient's vision.

The Triage Framework

When a patient presents with an acute complaint, your assessment should address three questions:

Is this a vision-threatening or life-threatening emergency requiring immediate evaluation today?
Is this an urgent problem requiring evaluation within 24 to 48 hours?
Is this a routine problem that can be scheduled during normal appointment slots?

Always err on the side of escalating urgency when in doubt. Document all triage decisions and communications.

True Ocular Emergencies (Immediate)

The following conditions are true emergencies requiring same-day or immediate evaluation:

Condition	Key Symptoms	Why Urgent
Acute angle-closure glaucoma	Severe eye pain, fixed mid-dilated pupil, halos, nausea	IOP can permanently damage optic nerve within hours
Chemical burn (alkali or acid)	Burning, severe pain, corneal whitening after chemical splash	Tissue destruction continues until chemical is neutralized
Penetrating ocular trauma	History of projectile; teardrop pupil; soft/misshapen eye	Open globe risks infection and intraocular contents extrusion
Central retinal artery occlusion (CRAO)	Sudden, painless, profound vision loss in one eye	90-minute window for potential thrombolysis treatment
Retinal detachment	Curtain in vision, sudden shower of floaters, flashes	Macular-off detachments cause permanent central vision loss
Endophthalmitis	Post-surgical pain, vision loss, hypopyon	Rapidly progressive; vision lost within days untreated

Chemical burns are the one true ophthalmic emergency where treatment must begin before the patient is even seen by the physician. Immediate copious irrigation with water or saline (at least 1 to 2 liters) for 20 to 30 minutes should begin the moment the patient arrives, before any history taking. Every minute of delay allows continued tissue damage.

Urgent Conditions (24 to 48 Hours)

These conditions require prompt evaluation but are not requiring immediate treatment within minutes:

New floaters or flashes without curtain (rule out retinal tear before it detaches)
Corneal abrasion with significant pain (risk of infection if untreated)
Suspected microbial keratitis (painful red eye in contact lens wearer)
New diplopia (may indicate a cranial nerve palsy requiring neurological workup)
Sudden onset ptosis (may indicate Horner's syndrome or CN III palsy)
Herpes zoster (shingles) with rash near the eye or on the tip of the nose (Hutchinson's sign, risk of herpes zoster ophthalmicus)

Semi-Urgent Conditions

Conditions that should be seen within a week include:

Subconjunctival hemorrhage (usually benign but needs evaluation if traumatic or recurrent)
Mild conjunctivitis without significant pain
Chalazion or stye (if not draining spontaneously)
Minor eyelid swelling without proptosis

When to Call 911 or Direct to the ED

Some presentations require emergency medical services rather than the eye clinic:

Suspected stroke with sudden vision changes and neurological symptoms
Severe head trauma with eye involvement
Giant cell arteritis (temporal arteritis) with sudden vision loss in an older adult and jaw claudication or temporal headache
Any presentation with systemic instability (loss of consciousness, confusion, severe hypertension)

Key Takeaways

Chemical burns require immediate irrigation before any other assessment; do not wait for the physician.
Acute angle-closure glaucoma, CRAO, retinal detachment, and open globe injuries are true same-day emergencies.
New flashes and floaters without a curtain are urgent (24-48 hours) to rule out retinal tear.
Always document triage decisions; when in doubt, escalate urgency and notify the physician.
Symptoms of stroke or giant cell arteritis with vision loss require emergency medical evaluation, not just an eye appointment.

Frequently Asked Questions

What should a CPO do first when a patient arrives with a chemical splash in the eye?

Irrigation must begin immediately, before any history taking, visual acuity, or physician examination. Use tap water, normal saline, or a balanced salt solution (such as LR irrigating solution) and irrigate continuously for 20 to 30 minutes, aiming for at least 1 to 2 liters of fluid. The goal is to dilute and wash away the chemical. Alkali burns (lye, cement, drain cleaners) are more dangerous than acid burns because alkalis continue to penetrate and liquefy tissue after initial contact. After irrigation, check pH with litmus paper; irrigation should continue until pH is 7.0 to 7.4. Then notify the physician for further evaluation.

What is the difference between a retinal tear and a retinal detachment, and how do symptoms differ?

A retinal tear is a break in the retina that allows vitreous fluid to pass underneath, potentially leading to detachment. Symptoms are sudden new floaters and photopsia (flashes of light from vitreoretinal traction). A retinal detachment occurs when the retina separates from the underlying RPE and choroid. The hallmark symptom that distinguishes detachment from a tear alone is a curtain, shadow, or veil in the peripheral visual field, moving toward the center. Any curtain in vision is a same-day emergency. Floaters and flashes without a curtain are urgent (same-day to 24 hours) but not immediately emergent.

What is Hutchinson's sign and why is it clinically important?

Hutchinson's sign is a rash or vesicles on the tip and side of the nose caused by herpes zoster ophthalmicus (HZO). The tip of the nose is innervated by the nasociliary branch of CN V1, which also supplies the eye. A rash in this distribution indicates that the ophthalmic branch of the trigeminal nerve is involved, putting the eye at risk for herpes zoster keratitis, uveitis, and other serious ocular complications. Any patient with facial shingles and Hutchinson's sign should be seen by an ophthalmologist promptly, even if they have no ocular symptoms yet.

What symptoms suggest a central retinal artery occlusion (CRAO)?

CRAO presents with sudden, painless, profound vision loss in one eye, often described as the vision going out like a light being turned off. There is no pain, redness, or discharge. On examination, the affected eye has a pale, ischemic retina with a cherry-red spot at the macula (the choroidal blood supply preserved under the thin fovea contrasts with the surrounding pale ischemic retina). CRAO is an ophthalmic equivalent of a stroke, and some centers attempt treatments within a 4.5-hour window. The underlying cause (emboli from carotid artery, cardiac, or other sources) must be investigated urgently to prevent a systemic stroke.

How does a CPO differentiate a subconjunctival hemorrhage from a more serious condition?

A subconjunctival hemorrhage (SCH) is a bright red, well-defined area of blood under the conjunctiva that does not extend into the cornea and does not cause pain or vision changes. It looks alarming but is usually benign, caused by minor trauma, straining, coughing, or spontaneously. It requires no treatment and resolves in 1 to 2 weeks. SCH becomes concerning if: it is associated with trauma (rule out open globe), it is recurrent (rule out coagulopathy or hypertension), it is associated with pain or vision change (rule out globe perforation or other pathology), or it extends into the cornea. Any SCH with pain, vision change, or significant trauma history needs physician evaluation.