Chronic dacryocystitis is caused by the accumulation of pus, in which virulent bacteria often thrive, especially S. pneumoniae and Streptococcus haemolyticus, which tend to multiply. The pus often drains into the conjunctival sac, leading to chronic inflammation of the conjunctiva; when the cornea is slightly traumatized or internal eye surgery is performed, it can cause runny corneal ulcers or intraocular infections, often destroying the entire eye. Because of this serious potential danger, it is important to treat chronic lacrimal sacculitis promptly. The tear duct should be routinely checked before internal eye surgery, especially in those with tear overflow, and if there are any abnormalities, tear sac surgery should be performed before surgery; in acute internal eye surgery, the upper and lower tear dots should also be temporarily closed by electrocoagulation