Corneal Foreign Body
When a particle or object becomes lodged on or in the surface of the cornea.
Symptoms
Common signs to watch for.
- Feeling like something is in your eye
- Sharp pain or discomfort
- Watery eyes and excessive tearing
- Redness in the affected eye
- Sensitivity to light
- Blurred vision in the affected eye
Home Care Tips
Things you can do at home to relieve symptoms.
- Do NOT rub the eye
- Flush the eye gently with sterile saline or clean water
- Try blinking rapidly to encourage natural tear flushing
- Wash hands before touching near the eye
- Remove contact lenses if worn
When to Seek Professional Help
Contact us immediately if you experience any of the following:
- The object does not flush out easily
- Vision remains blurred after flushing
- You experience increasing pain
- The object is metal (rust ring risk)
- The eye becomes increasingly red or discharge appears
- You suspect the object penetrated the eye
About Corneal Foreign Body
Understanding Corneal Foreign Bodies
A corneal foreign body occurs when a small particle or object becomes lodged on or embedded in the cornea—the transparent, protective front surface of the eye. Common culprits include metal flakes from grinding or drilling, wood splinters, sand particles, stone fragments, or insect parts. Because the cornea is densely packed with sensitive nerve endings, even a microscopic particle triggers immediate sharp pain and intense tearing.
Beyond immediate discomfort, an unremoved foreign body poses significant clinical hazards. A foreign body can introduce infectious pathogens into the corneal stroma, resulting in a corneal ulcer (microbial keratitis). Metallic particles containing iron can oxidize within hours, leaving a toxic "rust ring" in the tissue that requires careful ophthalmic debridement to prevent permanent scarring.
Key Diagnostic and Treatment Considerations
- Assessment using slit-lamp biomicroscopy to determine depth of particle penetration
- Inspection beneath upper and lower eyelids to detect hidden retained debris
- Evaluation with fluorescein dye staining to map corneal epithelial defects
- Use of specialized micro-instruments under topical anesthesia for safe removal
- Preventive antibiotic drops and follow-up monitoring to confirm complete epithelial healing
Sources & Medical References
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