A white particle on the eye, usually according to the location of the different parts, there are the following situations: first, located in the black eye on the white particles, indicating that the cornea appeared inflammatory lesions, the original transparent cornea appeared to limit the opaque tissue, so the whitening is usually due to eye trauma, such as being cut by twigs, leaves, or rubbing the eyes and other contamination of the cornea and the triggering of the infection, the pathogens to the bacterial, The most common pathogens are bacteria, viruses, fungi, etc. Secondly, the white particles located on the left and right sides of the black eyeballs are caused by blepharospasm, which is more common in middle-aged and elderly people, and is caused by conjunctival degeneration and aging; thirdly, the white particles located at the junction of the black and white eyeballs are due to vesicular keratoconjunctivitis, which is caused by autoimmune reactions, and is related to the existence of underlying immune system diseases or bacterial infections, resulting in cross immune reactions. Cross-immune response is associated.