system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: When I close my eyes and blow my nose, I feel an air bubble in the inner corner of my eye. Why?
gpt
Your tear duct (nasolacrimal duct) is connected to your sinuses.

There's a flap that's supposed to keep the two separate, but in some people, it doesn't quite seal.

You're trying to blow air through your nose, but because of the pressure, some of the air leaks through your tear duct.

If you're bored, search the internet for "squirt milk from eye". It's a very clear indication of the connection.