No it is not a simple question at all.  The mechanism
by which the eye remains lubricated is clearly very
complex.  I am not an eye doctor but even I can see that.

The way you post here is really strange.  If the "learned
men" (as you call them) cannot immediately tell you
exactly what causes something, you say "why listen to
them, they do not know the cause so how can they treat
the cause if they do not know it".

Yet when you ask these same "learned men" to answer a
question which is relatively simple, namely something like
"what causes astigmatism", they give you a simple and
clear answer: the cause is a cornea or a lens which is
not circularly symmetric.

So, if treating the cause is so important to you,
then tell me, how do your "exercising" techniques
and "sungazing" treat this cause?  In another thread,
you claim that these things can cure astigmatism.  So how
do they treat the cause?  Do they change the shape of the
cornea and lens, so they are now symmetric? If so, explain
please how this happens.

I'm sure you won't be able to explain.  I'm sure you
will tell me that this is all wrong, that circular
symmetry has nothing to do with it.  And in so doing, you
will just prove that you do not have a clue about anything
you are talking about.

And by the way, every sensible person in the world knows
that "looking at the sun" will do nothing but cause
irreparable damage to the retina.  For your sake, I hope
no one is actually listening to you.  As soon as someone
does, and permanently damages their eyesight, you will
have a lawsuit on your hands.  A big big one.  Just try
"practicing medicine without a license" for starters.
I know you are in Italy and not the US, but Italy must have
some kind of law like that.  One day, you will find out.