Lacrimal passage without obstruction means that when the tear duct rinse test is performed, although the rinse solution can enter the nasal cavity, indicating that the tear duct is open, the resistance is relatively large, usually due to the narrowing of the tear duct. Lacrimal flush examination is a common examination means to diagnose the existence of lacrimal obstruction and lacrimal stenosis. If the rinsing liquid can not enter the nasal cavity during the rinsing examination, it means that the lacrimal duct is obstructed, and if the rinsing liquid can enter the nasal cavity but the resistance is relatively large when rinsing, that is to say, the lacrimal flush passes but does not work well, then the lacrimal duct is stenotic. For patients with lacrimal stenosis, if the symptoms of tearing often occur in normal times, the tear duct can be placed through the tear duct surgery to support the tear duct, to relieve the narrowing of the tear duct and alleviate the symptoms. It is recommended to go to the hospital in time for examination and symptomatic treatment if the tear duct is not smooth.