Why is she having surgery? This happened to both Katie's eyes and she recovered with antibiotic eye drops and lubrithal lubricant applied 4 times daily. It might be worth trying if her age is a concern. The vet was told be a specialist it's usually occurs in overweight buns, Katie was very overweight, she has list weight and her eyes are much better but still swell up like that when her bottom is checked. It's apparently something to do with a very large dewlap, reducing blood flow or something like that, can't fully remember what I was told. I'm on my phone so can't post photos but perhaps someone nice could put up that thread.