When Corneal Ulcers Get Complicated

A seemingly minor ulcer can lead to the loss of vision or the eye itself if complications arise. Here’s what to know.
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Leave it to an equine corneal ulcer to ruin everybody’s day.

These painful defects are notoriously difficult to treat, mainly because veterinarians must understand the underlying destructive processes to manage them effectively—and the variety of pathogens that can be involved. To complicate things further, ulceration can expand and deepen in the absence of infection because of how the horse’s immune system on the surface of the eye responds. Worst-case scenario, ulcers can lead to the loss of vision or even the eye itself, if not properly managed in time.

An ulcer—technically, a loss of epithelium and stroma (the top two corneal layers) down to the third layer, Descemet’s membrane—“is a host response that has gone horribly wrong,” said Andrew Matthews, Hon Member ACVO, Dipl. ECEIM (Ret), FRCVS, an equine practitioner and ophthalmologist from Angus, Scotland. He described how to manage complicated corneal ulcer cases at the 2016 British Equine Veterinary Association Congress, held Sept. 7-10 in Birmingham, U.K

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Written by:

Stephanie L. Church, Editorial Director, grew up riding and caring for her family’s horses in Central Virginia and received a B.A. in journalism and equestrian studies from Averett University. She joined The Horse in 1999 and has led the editorial team since 2010. A 4-H and Pony Club graduate, she enjoys dressage, eventing, and trail riding with her former graded-stakes-winning Thoroughbred gelding, It Happened Again (“Happy”). Stephanie and Happy are based in Lexington, Kentucky.

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