This.ype of corneal ulcer is usually associated with a connective tissue disease, such as rheumatoid arthritis A, Sjögren syndrome, Moore ulcer, or a systemic vasculitic disorder Ag, systemic lupus erythematosus SLE, Wegener granulomatosis, polyarteritis nodosa. If the eyelids do not close completely, consult your veterinarian about a possible surgical correction. Moore ulcer can only be diagnosed in the absence of an infectious or systemic cause. Bacterial and fungal infection occurs readily after the initial ulceration, as disruption of the corneal epithelium allows attachment and colonisation of the underlying tissues by normal corneal commensals . A corneal ulcer normally develops when the corneal surface is compromised or damaged in some way. The horse's eye is especially vulnerable to trauma due to its prominent position, compared with other species. Ulcers can be sterile meaning “not infected” by any bacteria or they can be infectious. In most cases, corneal ulcers are caused by germs that enter through a previous injury or scratch to the cornea.
Causes.f corneal ulcers include: Viral infections, including herpes Foster that causes shingles Eye injuries and small scratches on the eye's surface. Once the exact cause is known, you may be given drops that treat bacteria, herpes, other viruses, or a fungus. These common parasites can enter the eye and cause Acanthamoeba keratitis, a very serious eye infection that can result in permanent scarring of the cornea and vision loss. The infection produces enzymes that break down the corneal stoma. Development of a corneal ulcer associated with a connective tissue disease or a vasculitis carries a poor prognosis. This is most commonly seen in Pseudomonas infection, but it can be caused by other types of bacteria or fungi .