The lacrimal duct exploration effect time is determined by the cause of blockage, blockage site, the degree of blockage, specific analysis is as follows: 1, such as the blockage site is short, only a small section, in the exploration can be used to open the blockage of laser cautery, generally the day of exploration can be effective. Newborn lacrimal tract blockage is only a layer of membrane, the same day the effect of the probe, and will not be blocked; 2, such as the whole blockage, the probe is not effective, the probe will be blocked again after the extraction of the needle, such blockage requires surgery, the clinical application of tear duct release tube, the blockage will be propped open.