What is pannus? Chronic superficial keratitis, or pannus, is a progressive, inflammatory disease of the canine cornea. It is potentially vision threatening due to the development of dense corneal blood vessels, scarring, and pigmentation, as well as infiltration of “fleshy” granulation tissue. Typical pannus usually begins at the temporal aspect of cornea closest to the ear and moves inwards, and in severe cases, it can cover the entire cornea leading to blindness. What cause