If contact lenses are removed and there is a foreign body sensation in the eye, and the white area of the eye is obviously congested, accompanied by tearing or an increase in eye stool, it is likely that the contact lenses are not hygienic or the hygiene standards were not met when they were removed and worn, resulting in bacterial infection in the eye and causing conjunctivitis. You can use levofloxacin drops to prevent infection and stop wearing contact lenses for two days until the congestion is completely gone and the foreign body sensation subsides before considering wearing contact lenses. There is also a possibility that if there is not a lot of eye stool, the foreign body sensation is more obvious, and there is a sandy and painful sensation inside the eye, it is likely that the corneal epithelium was damaged when wearing contact lenses, so you need to use levofloxacin drops and calf blood eye gel to nourish the cornea and promote the recovery of the corneal epithelium. Usually, the corneal epithelium will recover completely in 1-2 days and the foreign body sensation will disappear.