HGV medical and glaucoma!

I was found to have raised iops when I had a eye test 6 yes ago ,the readings where 22,after tests at the local hospital, including the field vision on both eyes at the same time and a x-ray type thing on my eyes I was found to have thicker corneas than normal,this gives the higher readings on the puffer test.when I go for a eye test now I take a card from the hospital explaining this and to allow me to have readings up to 32,so far they have not risen any from the original test.