If you feel something under your eyelid, you may have a conjunctival stone. Conjunctival stones can be seen by themselves, turn over the eyelids, if you see yellowish-white granular objects on the surface of the lid conjunctiva, it is a conjunctival stone, commonly found in some older people or people with chronic conjunctivitis. Conjunctival stones are formed by mixing, drying, and hardening of degenerated white blood cells and epithelial cells shed from the conjunctiva. They are usually not felt, but when they protrude from the surface of the conjunctiva, they can cause a foreign body sensation. If it comes into contact with the cornea, it can also bruise the cornea and cause a stinging sensation. It is usually sufficient to pick out the conjunctival stone with the tip of a needle through a slit lamp under episodic anesthesia. Conjunctival stones can be prevented by drinking plenty of water, consuming less greasy food, and applying hot compresses and massaging the lids.