Liz Buchanan BVSc MRCVS
Hello - and as you may have predicted, I do not specialise in opthalmology. You do have an opthalmogical specialist, so they are 100% better set to give you advice than I am, not just because of their superior knowledge but because they have actually seen the patient! Furthermore, eye specialists know other eye specialists and it's likely that they discuss difficult cases together. However, I know what I'd ask if I was the client in this situation. I'd want to know; is there definitely an infection causing this? If there definitely is an infection, might it be worth culturing the bacteria and doing culture and sensitivity - particularly when it first appears - to identify the correct antibiotic to kill the bugs? What other reasons might there be for the green coming back - could there be a focus eg a foreign body hidden away somewhere? Is there a way to check?
It sounds to me that this is a difficult case to solve! - we all come across them from time to time and specialists in particular will usually do as much research as they can to uncover the answer for you. We would be delighted to hear what works for this case in the end.