Behavior changes may be the first clue to vision loss in horses

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The Horse on May 2 highlighted a practical but easy-to-miss clinical issue in equine care: horses with vision problems may present first through behavior, not obvious ocular disease. Drawing on interviews with Nicole Scherrer of the University of Pennsylvania’s New Bolton Center and Richard McMullen of the University of Zurich, the article outlines eight possible clues, including new spooking or refusals, different reactions in bright versus dark conditions, unusual head positioning, bumping into objects, seeming “lost” in new settings, headshaking or squinting, general behavior change, and, notably, no unusual behavior at all because horses can compensate well for vision loss. (thehorse.com)

Why it matters: For veterinary professionals, the piece is a reminder that a complaint framed as training trouble, stubbornness, or performance decline may warrant an ophthalmic exam. That’s especially relevant because common equine eye conditions that can impair vision include corneal disease, uveitis, cataracts, squamous cell carcinoma, and corpora nigra cysts, while recurrent uveitis remains the most common cause of blindness in horses. Early workup matters: AAEP notes equine eye problems are common and eye exams typically include assessment of comfort, symmetry, vision, reflexes, fluorescein staining, and, when indicated, intraocular pressure and dilation. (vet.cornell.edu)

What to watch: Expect continued emphasis on earlier referral and more routine ophthalmic screening when horses develop new one-sided spooking, lighting-related performance changes, or otherwise unexplained behavior shifts. (thehorse.com)