Eye Emergencies in Infants and Children

1. THE 2-MINUTE PHYSIOLOGY (Rapid Pathophysiology)

• Orbital Compartment Syndrome (Retrobulbar Hemorrhage): The pediatric orbit is a fixed, non-distensible bony pyramid bordered by the frontal, ethmoid, maxillary, and zygomatic bones. Blunt trauma causing hemorrhage into the retrobulbar space exponentially increases intraorbital pressure. Once intraorbital pressure exceeds central retinal artery perfusion pressure, profound ischemia of the optic nerve occurs, leading to irreversible blindness if not decompressed within 60 minutes.
• Globe Rupture: Mechanical failure of the corneoscleral envelope due to blunt or penetrating force. This leads to the extrusion of intraocular contents (such as the iris or vitreous humor), profound disruption of the visual pathway, and susceptibility to devastating endophthalmitis.
• Orbital vs. Preseptal Cellulitis Breakdown: The ethmoid bone separating the ethmoid sinus from the orbit, known as the lamina papyracea, is paper-thin. Pediatric sinusitis easily breaks through this delicate bony barrier, seeding the retroseptal space and threatening the optic nerve and extraocular muscles, creating a true ophthalmologic emergency (orbital cellulitis) compared to superficial skin infection (preseptal cellulitis).

2. THE BEDSIDE ACTION PLAN (Rapid ER Management)

• Immediate Stabilization & Positioning: Elevate the head of the bed to 30 degrees to naturally reduce intraocular pressure (IOP) in suspected globe rupture or retrobulbar hemorrhage.
• Globe Rupture Protocol: Place a rigid metallic Fox eye shield immediately over the affected eye. Keep the patient NPO. Administer aggressive systemic analgesia and antiemetics (e.g., IV Ondansetron) to prevent pain or vomiting from causing a Valsalva maneuver, which spikes IOP and forces further extrusion of ocular contents.
• The 60-Minute Canthotomy: For suspected Orbital Compartment Syndrome (OCS), emergent lateral canthotomy and inferior cantholysis is the definitive treatment to restore blood flow. This must be performed within 60 minutes of the injury to preserve vision.
• Chemical Burns: Initiate immediate, continuous, and copious irrigation with normal saline or Lactated Ringer's until the conjunctival pH normalizes to 6.5–7.5. You must recheck the pH at 5 and 30 minutes post-irrigation to ensure it has not shifted back.
• First-Line Antimicrobials: For simple corneal abrasions or bacterial conjunctivitis, prescribe Erythromycin 0.5% ophthalmic ointment (apply a 1 cm ribbon to the affected eye(s) every 6 hours for 7–10 days). If the child wears contact lenses, you must cover for Pseudomonas aeruginosa with topical fluoroquinolones.

3. THE DIAGNOSTIC GRID (Differential Diagnosis & Workup)

• Top "Can't-Miss" Mimics:
• Orbital Compartment Syndrome: Can mimic a benign periorbital hematoma ("black eye"), but features vision loss and a rigid orbit.
• Orbital Cellulitis: Frequently misdiagnosed initially as preseptal cellulitis. Must be ruled out if there is pain with eye movement or proptosis.
• Traumatic Hyphema: Blood in the anterior chamber. Must heighten suspicion for an occult open globe injury.
• Prioritized Diagnostic Workup:
• Visual Acuity: The fundamental "vital sign" of the eye. Must be documented in all capable children.
• Fluorescein Exam: Utilize a Wood's lamp or cobalt blue light. A positive Seidel sign (a waterfall-like clearing of fluorescent dye) proves aqueous fluid is leaking through a full-thickness corneal laceration/globe rupture.
• Gold-Standard Imaging: Non-contrast CT of the orbits is the preferred imaging modality for orbital fractures or serious traumatic eye injuries. CT orbits with contrast is mandated for suspected orbital cellulitis.

4. THE VISUAL BOARD (ECG / POCUS / Imaging)

• The Ruptured Globe Exam: Look specifically for a teardrop-shaped pupil (the pupil will peak toward the site of the laceration), a 360-degree subconjunctival hemorrhage, extreme enophthalmos, or a grossly herniated iris.
• The OCS Exam: Look for marked proptosis, restricted extraocular movements, and the presence of a Relative Afferent Pupillary Defect (RAPD).
• Point-of-Care Ultrasound (POCUS): POCUS is an excellent modality for posterior chamber injuries. A retinal detachment will present as a thick, hyperechoic line tethered to the optic disc (often looking like swaying seaweed) projecting from the posterior globe.

5. THE SCORING MATRIX (Risk Stratification & Guidelines)

• The Complex Eyelid Laceration Criteria: The ED physician must know which lacerations require specialized ophthalmologic or plastic surgery repair. Refer if the laceration exhibits any of the following:
• Full-thickness lacerations.
• Involvement of the lid margin.
• Deep lacerations involving muscle, tarsal plate, or canthal ligaments.
• Involvement of the medial one-third of the lid (high risk for canalicular system injury).
• Substantial tissue loss.
• True Ophthalmologic Emergencies List: Board guidelines mandate immediate ophthalmology consultation for: globe rupture, intraocular foreign body, central retinal artery occlusion, endophthalmitis, chemical burns, orbital infection, and orbital compartment syndrome.

6. THE DANGER ZONE (Pitfalls & Critical Actions)

• The POCUS / Tonometry Trap: A deadly cognitive trap is attempting to perform an ocular ultrasound or test intraocular pressure (IOP) on a patient with a high likelihood of an open globe injury. Critical Action: You must completely avoid any diagnostic or therapeutic intervention that places pressure on the eyeball in a suspected globe rupture.
• The Preseptal Premature Closure: Diagnosing a swollen red eye as preseptal cellulitis without fully assessing extraocular movements. Critical Action: If there is ophthalmoplegia, pain with eye movements, or proptosis, it is orbital cellulitis requiring admission, broad-spectrum IV antibiotics, and an urgent CT scan.
• The "Wait for CT" Canthotomy Delay: Delaying decompression of an orbital compartment syndrome while waiting for the CT scanner. Critical Action: Time is vision; a lateral canthotomy must be performed clinically and empirically within 60 minutes to prevent permanent blindness.

7. MCQ MASTERCLASS (Written Exam Tips)

• The "Teardrop Pupil" Buzzword: If a vignette describes a child struck in the eye presenting with a "teardrop pupil" or a positive "Seidel sign," the answer is always Globe Rupture.
• The "Rust Ring" Distractor: A patient presents with a metallic foreign body and a rust ring on the cornea. A common distractor is "Emergently remove the rust ring in the ED with an Alger brush." The correct answer is to leave the rust ring and arrange ophthalmology follow-up within 24 hours, due to the high risk of iatrogenic corneal injury in the ED.
• The "Lamina Papyracea" Anatomy Fact: Exam questions often ask which bony structure is responsible for the spread of sinus infection to the orbit. The answer is the paper-thin ethmoid bone (lamina papyracea).
• The "Contact Lens" Pathogen: A teenager who slept in their contacts presents with a corneal abrasion. The distractor will be Staphylococcus. The correct answer is Pseudomonas aeruginosa, which mandates treatment with a topical fluoroquinolone.

8. THE BOARDROOM SCRIPT (OSCE & Oral Board Tips)

• The Primary Assessment Hook: "I am presented with a pediatric ocular trauma patient. After ensuring airway and hemodynamics, I will immediately establish visual acuity—the vital sign of the eye. I will elevate the head of the bed to 30 degrees to decrease intraocular pressure. Because I suspect a globe rupture, I will strictly avoid ocular ultrasound or tonometry."
• The Rupture Pivot: "My exam reveals a teardrop pupil and a positive Seidel sign on fluorescein staining. This is an open globe injury. I will immediately place a rigid Fox eye shield over the orbit. I will make the patient NPO, order IV Ondansetron and Morphine to prevent Valsalva-induced pressure spikes from vomiting or pain, and consult ophthalmology for emergent surgical repair."
• The Canthotomy Escalation: "The patient's orbit is rock-hard, proptotic, and an afferent pupillary defect is present. This is an acute orbital compartment syndrome resulting from a retrobulbar hemorrhage. Time is vision. I will not delay for a CT scan. I am gathering my instruments to perform a lateral canthotomy and inferior cantholysis immediately."