The causes of tearing are usually the following: firstly, foreign bodies such as threads, dust and irritating gases irritate the eyes, you can flush the eyes with eye drops and saline to expel the foreign bodies; secondly, the eyelashes grow malformed inwards and irritate the eyes for a long time causing tearing, which needs to be corrected through an inverted eyelash surgery; thirdly, the nasolacrimal duct is blocked, you can flush it first, if the flushing does not pass, then only a lacrimal intubation can be performed.
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