I was first diaganosed with glaucoma in 1993 after a left branchiole
occulusion. I had always been checked for glaucoma so it must have
appeared after my previous change in glasses. It has worsened in the last
two years, progressing from Timolol to Cosopt, and then adding Alphagan,
and finally Lumigan. For the last 6 - 8 months, I.O.P. have been stuck at
mid to high twenties in both eyes. My field tests have not deteriorated,
and there has been no evidence of optic nerve damage, even with moderate
Type 2 Diabetes (A1c ranges 6.0 to 6.5).

In January, my ophthamologist checked the drainage angle (goniscopy)
which seemed fine, and had an "orbscope" (sp?) done to measure corneal
thickness before he considered doing a trab. The measurement has come
back at 620 microns, considerable thicker than the supposed average of
520 - 550 microns. He considers my readings to have been elevated by 5
points because of this, and so yesterdays measurements of L26, R27 were
not as much of a concern as before, and I will be continuing on the drops
only.

Checking resources from the FAQ's and Google, the adjustment ranges to
I.O.P. for corneal thickness varied, and I was unable to get a hold of
the data that indicates the sliding scale used.

Is 5 points a reasonable adjustment for a tonoscope reading when the
cornea is at 620 microns?

Dennis