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Some additional information...glaucoma is very painful. There is probably significant damage to the eye already and once the eye is large...swollen to where you can see it bigger, the retinal damage is significant enough the eye is blind. Blindness is not a problem..but even with blindness, the pressures will still go up and down. Meaning, it may be a blind eye but the pressures will increase periodically and cause significant pain. The evidence of pain is not eating, crying, pacing...
Anyway, even thou you may not be able to surgical correct glaucoma, you need to think long term with the eye. There are two options...one is to surgically remove the eye so that pain is gone and the eye was already blind...OR there is an injection placed in the eye that causes it to slowly die and absorb. Now I know this is upseting to hear, but as long as the eye is present whether it is visual or not...the constant cycle of pain will be there. With the injection the medicine kills the nerves and cells so the process of the eye absorbing is painless.
You don't have to make the decision now, but please discuss these options with your vet...both of these are much more preferred than putting your dog to sleep.
Let me know if you have further comments of questions.