The pic is a little fuzzy but that looks worse than just a common runny eye. Don't panic but the one time in 40 years of I waited an extra day the cat lost sight in that eye.
Without knowing any more I wouldn't wait until Thursday. Is the eye running? Any nasal drip?
I would get him to a clinic right away.
Anyway, one of his pupilis big and dark, and the size does not change w/light.

Not sure if my previous thread work. Anyway, Thurmond eyes look like the picture. BG at noon today: 121
Called the vet, cannot see him until Thursday! Should I be concerned?
Hope to hear from you and Thurmond soon. 