Glaucoma in dogs

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Anyone experienced this in their dog?
A friends dog RebusI looked after a week ago seemed to have a swollen eye which I pointed out. He has since taken him to the vet and they are talking of glaucoma or possibly a tumour at the back of the eye I think he will now be refered to an eye specialist vet( whatever they are called}
ATM Rebus is on painkillers.

[SPR2]

He seems fine thank you. I have him for a week as owner has had a knee operation.
Rebus is on CarbrodylF 50mg twice a day until Monday when we hope the vet will give referal details.