The condition of feeling something inside the eye, but then finding nothing when you examine it, can be seen for several reasons: first, an impingement. Ingrown eyelashes can cause significant eye irritation, so in this case, they can be removed. If the number is high, electrolysis or surgical correction is also an option; secondly, local inflammation. For example, conjunctivitis and keratitis, inflammation can cause eye irritation, including pain, photophobia, tearing or foreign body sensation, which requires anti-inflammatory and symptomatic treatment; third, eye fatigue. Long-term overuse of the eyes may cause eye fatigue and lead to dry eyes, which can cause a significant foreign body sensation in the eyes. In this case, the first thing you need to pay attention to is to maintain the correct method of eye use, you can use artificial tears to relieve the symptoms, such as sodium vitreous oxide drops.