Patient: My baby is almost 4 months old and the nasolacrimal duct in one eye is not yet open. My baby was born more than 30 days ago and visited the Children’s Hospital. At that time, the ophthalmologist said that it would be fine if the medicine was added by touch, but now it has been almost 4 months and one eye is still not open. What is the longest period of time that a baby’s nasolacrimal duct is inoperable that requires surgery? Doctor: If there is a discharge, you should go to the hospital outpatient treatment room to do the tear duct flushing or tear duct exploration in the affected eye, but the child should cooperate, it is not possible to apply anesthesia to facilitate treatment.