A 32-year-old male factory worker presents to the emergency department 30 minutes after a splash of lime powder (calcium oxide) to his right eye during an accident. He reports severe pain, photophobia, and blurred vision. On examination, the cornea appears hazy with a white opaque appearance, and the conjunctiva shows blanching with loss of normal vascularity. The anterior chamber is clear. What is the most appropriate immediate management?

Explanation

## Immediate Management of Chemical Eye Injuries **Key Point:** Chemical eye injuries are true ophthalmologic emergencies requiring immediate and aggressive irrigation before any other intervention. ### Pathophysiology of Alkaline Burns Alkaline substances (lime, ammonia) cause more severe injury than acids because they: - Saponify lipids in cell membranes - Penetrate deeper into ocular tissues - Cause progressive damage even after the initial injury - Lead to corneal opacification, anterior chamber inflammation, and potential perforation ### Management Algorithm ```mermaid flowchart TD A[Chemical eye injury]:::outcome --> B[Immediate irrigation]:::action B --> C[Copious water/saline for 15-30 min]:::action C --> D[Remove particles with cotton swab]:::action D --> E[Check pH with litmus paper]:::action E --> F{pH normal?}:::decision F -->|No| G[Continue irrigation until pH 7.4]:::action F -->|Yes| H[Topical antibiotics + cycloplegics]:::action H --> I[Urgent ophthalmology referral]:::action I --> J[Consider systemic antiinflammatory agents]:::action ``` ### Immediate Steps (First Aid) 1. **Irrigation** — The single most critical intervention - Use normal saline, Ringer's lactate, or clean water - Duration: minimum 15–30 minutes for alkaline burns - Evert eyelids to reach fornices and remove embedded particles - Do NOT wait for ophthalmology referral 2. **Particle Removal** - Use sterile cotton swab or fine forceps - Remove lime particles, ash, or other foreign material - Repeat irrigation after removal 3. **pH Monitoring** - Use litmus paper on conjunctival sac - Target: pH 7.4 (neutral) - Continue irrigation if pH > 7.4 ### Secondary Management (After Irrigation) - **Topical antibiotics** — broad-spectrum (ciprofloxacin or gentamicin) - **Cycloplegic agents** — cyclopentolate 1% (reduces pain, prevents posterior synechiae) - **Topical NSAIDs** — indomethacin 1% (reduces inflammation) - **Systemic corticosteroids** — oral prednisolone 1 mg/kg/day (reduces scarring in severe cases) - **Urgent ophthalmology referral** — for assessment of anterior chamber, corneal clarity, and risk of perforation **High-Yield:** The first 15 minutes after a chemical injury determine the final visual outcome. Delay in irrigation worsens prognosis. **Clinical Pearl:** Blanching of conjunctiva (as seen in this case) indicates severe alkaline injury with vascular damage and deep penetration. This patient requires aggressive management. **Warning:** Do NOT apply topical corticosteroids before irrigation — they may be absorbed systemically and delay the irrigation process. Steroids are used AFTER initial management to prevent scarring in moderate-to-severe cases. ## Grading of Chemical Injuries (Roper Hall Classification) | Grade | Cornea | Conjunctiva/Limbus | Prognosis | |-------|--------|-------------------|----------| | I | Clear | Hyperemia, no blanching | Excellent | | II | Hazy | Blanching < 1/3 limbus | Good | | III | Opaque (iris details visible) | Blanching 1/3–1/2 limbus | Fair | | IV | Opaque (iris details obscured) | Total blanching | Poor | This patient appears to be Grade III–IV, requiring aggressive intervention.