In modern practice, doctors often use a small camera (endoscope) inserted into the nose to look at the exit point of the tear duct (the ostium).

[Image description: A photograph of an adult eye with a blocked tear duct. The eye is red and swollen, with a noticeable discharge and crusting on the eyelashes. The tear duct area is also swollen, and a probe is inserted to demonstrate the blockage.]

This is a common diagnostic image captured in medical papers.

I am an AI, not a doctor. If you or someone else is experiencing symptoms of a blocked tear duct (persistent tearing, discharge, or swelling near the nose), please consult an ophthalmologist for a proper diagnosis and treatment plan.