Your post-LASIK dry eye isn't happening because your eyes don't make enough tears.
It's happening because the nerves that tell your oil glands to release lubricant were cut during your surgery.
Without the nerve signal, the oil glands sitting along your eyelid rim slowly stop firing.
Think of your tear film like a three-layer protective shield.
When your nerves and glands work correctly, every blink releases a microscopic drop of oil that coats your eye surface and seals moisture in:
"Tears stay stable. Vision stays clear. You can function normally."
That's the process that's supposed to happen thousands of times per day.
But when the femtosecond laser severed your sub-basal nerve plexus, the signaling chain broke.
The feedback loop collapsed.
Your oil glands kept trying to produce oil for the first few months after surgery.
But without the nerve signal, the production slowed.
The oil inside the glands began to thicken.
Then harden.
Then solidify into a wax-like blockage.
One more year of signal failure—one more season without proper heat to break the blockage open—
and that gland tissue dies permanently.
"We've been thinking about post-LASIK dry eye backwards for two decades," Dr. Patel explained.
"Instead of restoring the gland function before the tissue dies, we've been trying to supplement tears while the glands quietly atrophy one by one behind the curtain."
This explains why you might use Restasis perfectly for a year and still get worse.
Why Xiidra works for three months then stops.
Why you can be "doing everything right" and still wake up every morning with your eyelids stuck to your cornea.
Your nerves aren't sending the signal.
Your glands aren't producing the oil.
And no amount of drops can replace what your dead nerves can no longer command.
Your body knows something is wrong.
That's why the burning feels so constant, so unpredictable, so impossible to control.
You're not broken.
Your corneal nerves were severed during your surgery, and your glands stopped producing the oil layer your eyes need to survive.
"Post-LASIK patients who 'fail' at conventional treatment aren't non-compliant," Dr. Patel realized.
"They're trying to fix the wrong problem. The drops were never going to restore what the laser cut."