If you see something in the conjunctiva, you can use a sterile cotton swab to dab it out. If the foreign body is in the cornea, you can use eye drops to flush it out, but some of them are deeper and cannot be removed. If you can’t get it out, you have to ask the doctor to use anesthesia to remove the foreign body from the cornea after the anesthesia. There is another kind of foreign body sensation is also relatively common, is the cornea dry eye patients, when the eye tear deficiency, serious cases of corneal epithelial defects, dotted defects or lamellar defects, when the corneal epithelial defects will have a foreign body sensation, usually see too much cell phones, computers or blowing too much air conditioning, or stay up too late with the eyes caused by. If you have such symptoms, you only need to put on artificial tear drops and rest, most of them can recover on their own, but if you can’t, you need to go to the hospital to use drugs to promote corneal repair. Other diseases of the eye can still cause foreign body sensation, such as conjunctivitis, there can be papillae and follicular hyperplasia in the eye, which can rub the eye and cause foreign body sensation, and there can be stones in the conjunctiva, which are white particles that rub the eye and cause foreign body sensation, and some elderly people or children often have the phenomenon of inverted eyelashes, which means that the eyelashes are stuck to the cornea. The foreign body sensation will be stronger. In addition, patients with keratitis may have a defect in the cornea or a lesion in the corneal ulcer, which may be accompanied by photophobia and lacrimation. In addition, there is also the blockage of the ciliary gland, which is a very common disease. The ciliary gland secretes oil, and the opening is at the root of the eyelashes, so when it is blocked, there will be fat plugs on the lid margin, and these fat plugs will rub the eyeballs, which will also cause foreign body sensation.