Irshadbharti, Here is some information from the Glaucoma Research Foundation and National Eye Institute on the most common and effective tests for detecting Glaucoma -- including the newer procedure, GDX you mentioned.

http://www.glaucoma.org/learn/diagnostic_test.php

http://www.nei.nih.gov/health/glaucoma/glaucoma_facts.asp

I was wondering why my cyst comes back at the same place, on my right thigh area?

I am 40 year old Indian .I was diagonised with High Intra ocular pressure.OCT was found normal with ,low average thickness. Visual fields were said to be within limits. doctors are differing on whether I have Glaucoma.I am taking eye drop XALATAN (LATANOPROST) every night.
Which is conclusive test for Glaucoma ?any thing called GDX?Any good hospital in Spain (Madrid or seville)?