What causes a foreign body sensation in the eyes, and how is it treated?

　　A foreign body sensation in the eye may be caused by external foreign objects, eye strain, conjunctivitis, dry eye syndrome, keratitis, etc. Symptoms can be improved through removing the foreign object, resting the eyes, and medical treatment. If the sensation persists or worsens, or is accompanied by eye pain, photophobia, or tearing, prompt medical attention is necessary.

　　1. External foreign object intrusion: Dust, eyelashes, or tiny insects entering the eye can directly irritate the conjunctiva or cornea, causing a distinct foreign body sensation along with reflexive tearing. It is recommended to rinse the eye with sterile saline solution and avoid rubbing the eye. Seek medical help promptly if the object cannot be removed.

　　2. Eye strain: Prolonged screen time or close-up visual tasks can cause eye muscle tension and excessive tear evaporation, leading to dryness and a foreign body sensation, often accompanied by eye fatigue and blurred vision. Limit screen time, take breaks every 30 minutes by looking into the distance, ensure adequate sleep, and increase environmental humidity.

　　3. Conjunctivitis: Inflammation of the conjunctiva caused by bacterial or viral infection leads to redness, swelling, and increased discharge, resulting in itching and a foreign body sensation. Under medical guidance, use medications such as levofloxacin eye drops, acyclovir eye drops, or erythromycin eye ointment to relieve symptoms.

　　4. Dry eye syndrome: Insufficient tear production or excessive tear evaporation leaves the eyes inadequately lubricated, causing dryness and a foreign body sensation, often accompanied by burning and light sensitivity. Patients may use sodium hyaluronate eye drops, polyethylene glycol eye drops, or vitamin B12 eye drops as directed by a physician to alleviate discomfort.

　　5. Keratitis: Inflammation of the cornea due to bacterial or viral infection or injury damages the corneal epithelium, causing a pronounced foreign body sensation, along with eye pain and decreased vision. Under medical supervision, use medications such as tobramycin eye drops, ganciclovir ophthalmic gel, or pranoprofen eye drops to improve symptoms.

　　Maintain good eye hygiene, avoid rubbing eyes with dirty hands, consume more fruits and vegetables rich in vitamins A and C, avoid prolonged exposure to dry or dusty environments, and maintain a regular作息 schedule to allow sufficient eye rest.