Went to an eye talk couple days ago.  The following (unresolved) question
came up.  When eye pressures are up (say in the posterior part of the eye)
it affects the optic nerve.  But pressures are measure in the front of the
eye.  The front chamber (anterior) is separated from the back chamber by the
lens, etc.  In the front chamber, a liquid  solution, in the rear a vitreous
gel.  So when the doctor measures the pressure in the front, what gives him
some indication that these two chambers track, that is, their pressures are
about the same?

Don W.