Why is my horse's eye sensitive to light after an injury?
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Overview
If your horse’s eye is sensitive to light after an injury, it often means the eye is irritated or painful, and there may be more going on than the outside injury alone. Common causes include a scratch to the eye, inflammation inside the eye, a foreign body, or swelling around the eye.
It’s not something to brush off, especially if the horse is squinting, tearing, or keeping the eye closed. Some causes are straightforward, but eye problems can change quickly, so it’s worth checking the details carefully.
Things To Check
1. Look at whether the horse is squinting, blinking more than usual, holding the eye partly closed, or avoiding bright light.
2. Check for tearing, sticky discharge, redness, cloudiness, swelling, or any change in the colour of the eye.
3. See whether there is a visible scratch, cut, rub mark, or swelling around the eyelids and face.
4. Note if the sensitivity started straight after a knock, a branch strike, grooming, dust exposure, or something getting into the eye.
5. Observe whether the horse is rubbing the face, keeping the head in shade, or becoming uneasy in bright daylight.
6. Check whether the pupil looks unusually small or uneven, or whether the eye seems dull or different from the other one.
7. Think about whether the horse has had eye trouble before, because repeat irritation can make light sensitivity more noticeable.
Common Causes
The most common reason is irritation from the original injury itself, especially if the surface of the eye has been scratched. Even a small scratch can make the eye very sensitive to light.
Inflammation inside the eye can also cause light sensitivity, and this may happen after trauma even when the outside injury looks minor. A foreign body, such as dust, bedding or a bit of debris, may also keep the eye sore.
Less commonly, swelling around the eye, a deeper injury, or an infection may be involved. These can’t be ruled out just by looking from a distance.
What To Do
Keep the horse somewhere calm and shaded so the eye isn’t facing strong sunlight or bright stable lights. Try to reduce dust, flies and other irritants around the horse.
Do not poke the eye or try to remove anything you can’t see clearly. Avoid using drops or creams unless they’ve been specifically advised for this situation.
Monitor the eye closely for changes in squinting, cloudiness, discharge, swelling or the horse becoming more uncomfortable. If the eye looks worse rather than better, or the horse seems strongly light sensitive, arrange veterinary advice promptly.
When To Contact A Vet
Contact your vet promptly if the eye is cloudy, the horse is keeping it closed, there is obvious pain, the pupil looks unusual, or the problem is getting worse. Eye injuries can look small at first but still need timely assessment.
Get urgent advice if there is a deep cut, heavy swelling, bleeding, a puncture, or any sudden change in vision or behaviour.
Products That May Help
If your horse has a minor eye-area knock or scratch and you’re managing day-to-day care, this collection may be useful for gentle stable-side first aid and routine cleaning support.
Related Questions
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Atlas is here to support owners with practical, easy-to-understand guidance. It is not a substitute for professional veterinary advice. If you're concerned about your animal's health, symptoms worsen, or something doesn't feel right, contact your vet.