Your eyes have a moisture seal you didn’t know about
Your tear film isn’t just water. It’s a three-layer system — and the most important layer is the thin oil coating on top, produced by tiny glands inside your eyelids called meibomian glands.
When that seal is intact, tears stay on your eye. When it breaks down, moisture evaporates in seconds — regardless of how many drops you use. This is why drops help for thirty seconds and then you’re dry again.
The oil layer is the lock. Drops are just water.