I understand what you are saying but when we first went to the vet which has been about 3 months ago he said it looked like maybe she had an old scratch from an old injury, which we did not know of any old injury, the spot on her eye that has just came in the last couple of days is in the dark part of her eye and is a purple/red color. why would prior the other antibiotics not work when tried twice. It is really a mess now and we have had no antibiotics recently because the vet just seemed like he really did not know why the excessive yellow stuff was there. If he does not know I don't want to see him again. I will try a new vet and the genteal eye lubricant but also when I used the wetting drops her eyes were really liquid then and weeping. Now it is a thick mess.
What can be done if it is an ulcer on the eye. He used a litmus paper and dilated the eye and said nothing seemed unusal on the test.