Immune Mediated Superficial Keratitis or Pannus is most commonly seen in German Shepherds, though other breeds such as Greyhounds and Border Collies can be affected.
Pannus is characterized by the accumulation of “fleshy” tissue on the cornea, conjunctival inflammation, and occasional involvement of the third eyelid. Colorado is often considered the mecca in the United States for the prevalence of this disease. This can be attributed to the high altitude, dry climate and high annual percentage of sunny days. This condition is most commonly seen in German Shepherds, though other breeds such as Greyhounds and Border Collies can be affected. As an immune-mediated disease, both eyes are involved and your pet will require ongoing long term medical therapy (i.e. prescription eyedrops) in order to achieve and maintain control. It is also important to limit major sun exposure as this will only serve to aggravate the disease. Immune-mediated Superficial Keratitis can never be cured, only managed. This is similar to immune mediated conditions affecting people, such as rheumatoid arthritis or lupus. If left untreated, pannus will undoubtedly progress, covering more of the cornea and subsequently impair vision further.
American College of Veterinary Ophthalmologists: More information on Pannus