★★★★☆
Glycerin is amazing. Within about an hour or so, she has her sight back. My dog is an English Cocker Spaniel. I measure out 10mls and just pour it into a bowl. She licks it up as it has a sweet taste.
The second remedy I use is Vitamin C. There are a lot of studies online about vitamin c and glaucoma. For dogs you need to give them the Ester C form of vitamin c as the other types can be a bit harsh on their stomach. I give my dog 1 tablet in the morning and 1 tablet at night. Each tablet is 625mg. At her last visit to the vet her pressure was so low, the vet had trouble measuring it. I think the vitamin c has something to do with that.