How common is red eye in a foreign body in the eye?

Dust, an eyelash, grit, or a small fragment can irritate the eye surface and trigger inflammation. The eye may water, blink repeatedly, feel gritty, or become sensitive to light. A foreign body under the upper eyelid can keep scraping the surface with each blink. Redness may remain after the object has come out if the surface has been scratched. Red eye can also have unrelated causes, so the sensation of something in the eye and the event that preceded it are useful details for assessment.

Wash your hands, avoid rubbing, and let tears flow naturally. Rinse the eye with clean water or sterile saline while blinking. Remove contact lenses if they come out easily. Do not use tweezers, fingernails, or cotton buds on the eye, and do not try to lift out an object that appears embedded. Stop rinsing and seek care if pain persists, vision changes, or the gritty feeling remains. Eye protection can help prevent repeat injury during dusty work or tasks involving fragments.

Get prompt medical care if the object struck the eye at speed, is sharp, appears stuck, or was a chemical or metal fragment. Pain that continues after rinsing, reduced vision, strong light sensitivity, bleeding, marked swelling, or difficulty opening the eye also needs urgent review. A clinician can use magnification and suitable dye to check for a surface scratch. Do not drive if vision is affected, and take chemical packaging or details of the substance if relevant.

Ask whether the surface is scratched and whether any material remains beneath the eyelid. Ask which drops are safe, whether you should pause contact lenses, and how long irritation should take to settle. Confirm what changes in vision, pain, or light sensitivity should lead you back for urgent review.