There are many reasons for this symptom, which can be divided into the following categories: first, the presence of local foreign bodies, such as corneal foreign bodies or conjunctival bursa foreign bodies, which need to be checked and removed early; second, the presence of conjunctival stones or impingement, which can be treated surgically, and impingement, which can be removed or electrolysis of the eyelashes. Thirdly, if there are local inflammatory diseases, such as mydriasis, conjunctivitis or keratitis, symptomatic treatment is needed to address the cause of the disease, and only when the irritating factors are resolved can the foreign body sensation in the eyes gradually disappear and return to normal.