Flush the affected eye immediately with clean, cool water or sterile saline to remove smoke particles. Ensure the child completely avoids rubbing his eye to prevent any corneal scratches or worsening inflammation. Apply a clean, cold damp compress over his closed eyelids to soothe burning and minimize mild swelling. You may use preservative-free lubricating artificial tears to help restore moisture and clear residual chemical irritants. Monitor his vision closely and seek immediate ophthalmic care if he develops severe pain or light sensitivity. Schedule an evaluation with an eye specialist if the mild redness and swelling persist beyond 24 hours