Eye Trauma in Horses: Corneal Injury, Blunt Trauma, and Emergencies

Eye trauma in horses means any injury to the eye itself or the tissues around it. This can include a superficial corneal scratch, a deeper corneal ulcer, a foreign body under the eyelid, eyelid lacerations, bleeding inside the eye, or blunt trauma from a kick, branch, trailer, fence, or fall. Because the equine eye is large and prominent, it is especially vulnerable to injury.

See your vet immediately if your horse suddenly squints, keeps the eye closed, tears excessively, or develops cloudiness. In horses, even a small corneal injury can become vision-threatening quickly. The cornea is constantly exposed to bacteria and fungi from the environment, so trauma can turn into infection or a "melting" ulcer if treatment is delayed.

Blunt trauma can also damage structures deeper inside the eye, including the iris, lens, retina, or the fluid-filled chambers. That means the outside may not tell the whole story. A horse with a painful eye needs a full ophthalmic exam so your vet can decide whether this is a surface injury, internal inflammation, rupture risk, or another emergency that needs referral.

Many equine eye injuries start with everyday barn and pasture hazards. Common causes include hay stems, bedding, dust, trailer accidents, fence wire, branches, kicks from other horses, and rubbing the face on feeders or stall hardware. A foreign body trapped under the eyelid can scrape the cornea every time the horse blinks.

Corneal ulcers are often caused by trauma to the corneal surface. Once that protective layer is damaged, bacteria and fungi can enter. This matters in horses because fungal keratitis and infected ulcers are well-recognized complications after corneal injury, especially when the horse lives in a dusty environment or has plant material exposure.

Blunt trauma may happen without an obvious wound. A kick or collision can trigger bleeding inside the eye, inflammation, lens damage, glaucoma, retinal injury, or rupture of the globe. Eyelid lacerations are another important cause of secondary eye problems because the eyelids protect and spread tears across the cornea. If the eyelid margin does not heal correctly, the cornea may stay irritated or dry.

Some horses also have underlying eye disease that makes trauma more complicated. Equine recurrent uveitis, facial nerve dysfunction, poor tear film, or prior corneal scarring can increase the risk of painful flare-ups, delayed healing, or repeat ulceration after even minor injury.

Your vet will usually start with a careful history and a hands-on eye exam, often in a dim area. Sedation may be needed for safety and comfort, and your vet may use a local nerve block so the eyelids can be opened without squeezing the eye. This helps protect the cornea while allowing a more complete exam.

A fluorescein stain is commonly used to look for corneal ulcers or leaks in the cornea. Your vet may also examine the eye with magnification and light, check pupil responses, and look for foreign material under the eyelids. Depending on the findings, they may measure eye pressure, evaluate tear production, or assess whether there is uveitis, glaucoma, hyphema, lens damage, or deeper trauma.

If the cornea is very cloudy or the inside of the eye cannot be seen well, referral imaging such as ocular ultrasound may be recommended. Horses with severe ulcers, stromal abscesses, suspected globe rupture, eyelid margin injuries, or poor response to early treatment may need referral to an equine hospital or ophthalmology service.

It is important not to apply leftover steroid eye medication before the exam unless your vet specifically directs it. Steroid-containing products can worsen a corneal ulcer and may complicate diagnosis and healing.

Not every eye injury can be prevented, but barn setup and daily observation make a real difference. Walk stalls, paddocks, trailers, and run-in sheds looking for sharp edges, protruding nails, broken boards, frayed wire, and low branches. Feed hay in a way that reduces stems and debris blowing into the face, and keep bedding and aisles as dust-controlled as possible.

Use well-fitted fly masks when appropriate, especially during insect season or in horses prone to rubbing and irritation. Introduce new herd mates carefully to reduce kick injuries. If your horse trailers often, check head clearance and interior hardware to lower the risk of facial and eye trauma during loading and transport.

Prompt attention to small eye changes is one of the best prevention tools. A horse with tearing, squinting, or recurrent redness should be examined early before a minor abrasion becomes an infected ulcer. Avoid using leftover eye medications from another horse, and never start a steroid eye product unless your vet has examined the eye and confirmed it is safe.

If your horse has a history of recurrent eye disease, ask your vet about a monitoring plan. Horses with prior ulcers, eyelid defects, facial nerve problems, or equine recurrent uveitis may need faster rechecks and more protective management than the average horse.