Hi everyone,
This study by Stanford University looks very promising! Schirmer test score increase of 125% !
https://www.medgadget.com/2015/12/eye-implant-producing-tears-fight-dry-eye-syndrome.html
Never mind the above!
Turns out a device called 'TrueTear' by Allergan, was approved by the FDA in 2017 - but despite being effective - production ceased due to high manufacturing costs!! ... What a bummer !!
Now it's inventor, Michael Ackermann, has set up another business venture, (Oyster Point), for a nasal spray that stimulates the same nerve as TrueTear.
ON A POSITIVE NOTE: At least some light has been shed on the circuitry behind dry eyes: stimulating the trigeminal nerve inside the nose can reverse dry eye symptoms. Actually, it might be the same malfunctioning nerve (or a branche off) which is causing dry mouth.