Sorry, luvakumal, I have no first hand info to offer but, apparently, no one esle does, either. So, I'll throw my 2 cents out there.
I've never heard of orbital decompression, so I had to look it up. I guess the big question in my mind is why you had the surgery. If it was cosmetic I doubt you will have any issues. I saw two medical reasons for the surgery, too; Hyperthyroidism and Grave's Disease. I know about as much about those as I did about your surgery, but now I'm curious and would be interested to hear what some of the docs have to say about diving and these two conditions.
Another thought, and I don't know how to ask this tactfully, do you ever have trouble with your mask making a seal around the eye that had the surgery?
It seems to me if your docs have signed off on your diving that you'll likely have no problems.
Maybe you could share a little about your experience?
Jim