This excellent talk by the consultant Neeru Vallabh is now easily available on the Glaucoma UK website and You Tube. For anyone who missed it then the speaker explains things so clearly.
This consultant has kindly returned to answer all the questions that remained at the end of the session. I was delighted to hear the answer to my question as I had not been able to see the surgeon ( he was off sick ) yet I was being booked in for surgery. Now I should be getting a phone consultation next month and will know what to ask.
So thank you to all the speakers and Glaucoma UK staff.