2.2 Ocular Trauma Assessment & Emergency Interventions
Key Takeaways
- Visual acuity testing is the essential 'vital sign' of ocular assessment and must be measured and documented prior to any eye manipulation, EXCEPT in cases of chemical burns.
- Open globe injuries require immediate placement of a rigid metal/plastic shield (Fox shield) resting on bony orbital margins; pressure patches and topical eye medications are strictly prohibited.
- Chemical eye burns demand immediate continuous irrigation with normal saline or lactated Ringer's using a Morgan lens before history taking or visual acuity testing, targeting a neutral pH of 7.0-7.4.
- Traumatic hyphema requires strict bed rest with the head of bed elevated 30-45 degrees, rigid eye shielding, and total avoidance of NSAIDs and aspirin due to high re-bleeding risks.
Ocular Trauma Assessment & Emergency Interventions
Ocular trauma represents a major cause of preventable blindness in acute care nursing. Emergency management requires rapid recognition of structural globe disruption, protection of viable tissue, immediate chemical decontamination, and prevention of secondary intraocular pressure (IOP) elevation. Trauma nurses must maintain high vigilance when evaluating orbital injuries accompanying panfacial trauma.
Emergency Assessment & Visual Acuity Protocols
Initial Examination Sequence
Except in chemical burns, determination of visual acuity is the essential "vital sign" of the eye and must be documented before physical manipulation, instillation of drops, or procedures.
- Visual Acuity: Assess each eye individually using a Snellen chart, pocket card, or by testing finger counting, hand motion, or light perception.
- Inspection & Extraocular Movements: Evaluate lid symmetry, conjunctiva, cornea, anterior chamber depth, and extraocular muscle mobility (unless open globe is suspected).
- Pupillary Exam: Assess direct/consensual light reflexes, pupil shape, and test for an Afferent Pupillary Defect (Marcus Gunn pupil).
Triage Exceptions & Contraindications
- Chemical Exposure: Visual acuity testing is deferred until copious continuous ocular irrigation is completed and ocular surface pH is normalized.
- Suspected Open Globe: Extraocular range of motion testing, intraocular pressure measurement (tonometry), and eyelid palpation are strictly contraindicated.
Open Globe Injuries & Penetrating Ocular Trauma
An open globe injury involves full-thickness disruption of the cornea or sclera caused by penetrating, perforating, or severe blunt force impact.
Pathophysiology & Clinical Recognition
| Clinical Feature | Pathophysiologic Significance | Diagnostic Appearance |
|---|---|---|
| Teardrop Pupil | Pupil deforms into a teardrop shape pointing toward the rupture site as the iris herniates into the defect. | Asymmetric pupil pointing toward wound margin. |
| Seidel Test Positive | Fluorescein dye applied to cornea is diluted by leaking aqueous humor, showing a streaming cascade. | Bright green streaming cascade under cobalt blue light. |
| Extruding Vitreous | Loss of anterior chamber integrity allowing brown/black uveal tissue or vitreous gel to prolapse. | Pigmented uveal tissue or gelatinous material at wound site. |
| Shallow Chamber | Collapse of space between cornea and iris secondary to aqueous humor loss. | Reduced clearance between cornea and iris on penlight exam. |
Critical Nursing Interventions
- Rigid Eye Shielding: Immediately place a rigid aluminum or plastic eye shield (Fox shield) over the affected orbit. The shield MUST rest firmly on the bony surrounding ridges (forehead, cheekbone, nasal bridge).
- Prohibition of Pressure: NEVER apply soft eye patches, gauze pads, or pressure dressings over a suspected open globe. External pressure forces intraocular contents out through the wound.
- Head Elevation: Maintain head of bed elevated 30-45 degrees to reduce IOP and venous congestion.
- Antiemetics & Analgesics: Administer IV ondansetron immediately to prevent retching, coughing, or vomiting, which cause dramatic spikes in IOP. Administer systemic analgesics for pain.
- Infection Prophylaxis: Initiate IV broad-spectrum antibiotics (vancomycin plus ceftazidime) immediately to prevent endophthalmitis. Update tetanus immunization.
Traumatic Hyphema Management
Traumatic hyphema is the accumulation of blood within the anterior chamber of the eye, typically resulting from blunt force tearing of iris or ciliary body vessels.
[Blunt Ocular Impact]
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[Tear of Iris/Ciliary Vessels]
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[Anterior Chamber Hemorrhage (Hyphema)]
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[Grade I-IV] [Secondary Re-Bleed] (Days 3-5)
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[Severe IOP Spike / Corneal Staining]
Grading & Clinical Characteristics
- Grade I: Blood occupying less than 1/3 of anterior chamber.
- Grade II: Blood filling 1/3 to 1/2 of anterior chamber.
- Grade III: Blood filling 1/2 to nearly full anterior chamber.
- Grade IV ("8-Ball" Hyphema): Total anterior chamber packed with dark red/black blood.
Bed Rest Protocol & Pharmacological Precautions
- Re-Bleeding Prevention: The highest-risk window for secondary re-bleeding occurs between days 3 and 5 post-injury, as initial fibrin clots degrade. Secondary hyphemas are often larger, causing intractable IOP elevation and corneal blood staining.
- Activity & Positioning: Strict bed rest with head of bed elevated 30-45 degrees allows blood to settle inferiorly, clearing the central visual axis.
- Medication Restrictions: NSAIDs (ibuprofen, ketorolac) and aspirin are strictly contraindicated due to antiplatelet effects that double re-bleeding rates. Treat pain with acetaminophen or short-acting opioids.
- Ophthalmic Drops: Topical cycloplegics (atropine) paralyze the ciliary muscle, reducing painful spasm and immobilizing the iris.
Chemical Eye Burns: Alkali vs. Acid Exposure
Pathophysiology of Chemical Tissue Damage
- Alkali Burns (Lye, Ammonia, Cement, Drain Cleaners): Alkali compounds undergo liquefactive necrosis, denaturing proteins and saponifying membrane lipids. This enables deep penetration into the anterior chamber, destroying the trabecular meshwork, lens, and optic nerve.
- Acid Burns (Battery Acid, Solvents): Acid compounds undergo coagulative necrosis, precipitating proteins that form a protective barrier (eschar) limiting deep penetration.
Immediate Continuous Irrigation Protocol & pH Targets
- Immediate Action: Begin copious continuous ocular irrigation immediately with normal saline or lactated Ringer's before taking history, examining the globe, or measuring visual acuity.
- Technique: Instill 1-2 drops of topical anesthetic (tetracaine) to overcome blepharospasm. Insert a Morgan lens or use dedicated intravenous tubing.
- Irrigation & pH Protocol: Irrigate continuously for a minimum of 30 minutes. Pause irrigation, wait 5-10 minutes, and test conjunctival sac pH. Continue irrigation until ocular pH reaches neutral (7.0 to 7.4) on repeat testing 10 minutes after fluid cessation.
Retrobulbar Hematoma & Orbital Compartment Syndrome
Retrobulbar hematoma results from rapid blood accumulation in the retrobulbar space following facial trauma, leading to orbital compartment syndrome.
- Clinical Signs: Severe ocular pain, proptosis, tight "rock-hard" globe on palpation, impaired extraocular movements, decreased visual acuity, and an Afferent Pupillary Defect.
- Emergency Intervention: Orbital compartment syndrome is a surgical emergency threatening optic nerve ischemia. If intraocular pressure exceeds 40 mmHg or visual acuity declines rapidly, a bedside emergency lateral canthotomy and cantholysis must be performed immediately to decompress the orbit.
A worker arrives in the emergency department after an industrial splash involving sodium hydroxide (drain cleaner) to the right eye. The patient reports severe ocular pain and blepharospasm. What is the immediate priority nursing action?
A patient presents with penetrating trauma to the left orbit. Physical examination reveals a teardrop-shaped pupil pointing toward a scleral laceration, extruding vitreous, and a shallow anterior chamber. Which intervention is essential in the emergency nursing care plan?
A 22-year-old athlete is admitted with a Grade II traumatic hyphema following a blunt impact from a baseball. In planning care to minimize the risk of secondary re-bleeding, which medication order should the nurse question?