Why is my horse keeping one eye closed after being turned out?
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Overview
If your horse is keeping one eye closed after being turned out, it usually means the eye is uncomfortable. Common causes include dust, a bit of hay or bedding, a minor scratch, an insect irritation or a bump to the eye area. Because eye problems can worsen quickly, it’s worth checking it promptly rather than waiting to see if it settles.
Things To Check
1. Notice when it started and whether it only happens after turnout, in windy weather, or after grazing in long grass.
2. Look for redness, watering, discharge, swelling, a cloudy-looking eye or any change in the pupil shape.
3. Check the eyelids and the skin around the eye for a graze, rub mark, cut or obvious swelling.
4. See if your horse is rubbing the face on gates, legs or the stable wall, or keeping the head tilted away from light.
5. Compare both eyes carefully. A difference in size, brightness or openness can be a useful clue.
6. Think about recent turnout conditions such as muddy fields, dust, flies, overhanging branches or seeded grass.
7. Check whether your horse is still bright, eating and behaving normally, or seems dull and head-shy.
Common Causes
The most common reason is simple irritation from dust, grass seed, bedding or flies. A mild scratch on the clear surface of the eye can also make a horse keep it shut, especially after turnout.
Sometimes the eyelids or surrounding skin are the problem, not the eye itself. A small knock, thorn, seed head or insect bite can make the area sore and tight.
Less commonly, the eye may be developing an infection or inflammation, or there may be a foreign body tucked under the lid. These can look similar at first, which is why close checking matters.
In some cases, keeping the eye closed can signal something more serious, such as a deeper eye injury or painful eye disease. You can’t rule that out just by looking from a distance.
What To Do
Bring your horse in from turnout if you can, especially if there is wind, dust or bright sunlight making the eye worse. Keep the environment calm and avoid unnecessary fuss around the face.
Look at the eye in good light without forcing it open. If you can see a loose speck on the surface, don’t try to remove anything that seems stuck.
Do not put in any medication or human eye drops unless your vet has told you to. Avoid rubbing, pressure or anything that could make a scratch worse.
Monitor for change over the next few hours. If the eye stays closed, becomes more watery, develops discharge, looks cloudy or your horse seems more uncomfortable, get veterinary advice.
If the problem seems linked to turnout, it may help to review field edges, hedge trimmings, dusty grazing areas and fly pressure before putting your horse back out.
When To Contact A Vet
Eye signs should be taken seriously. Contact your vet promptly if your horse keeps the eye closed, the eye looks cloudy, there is discharge, swelling, marked sensitivity to light, a visible injury, or the problem is not improving quickly.
Seek urgent advice if the eye looks badly painful, the horse is very distressed, or you suspect a puncture, foreign body or deeper injury.
Products That May Help
If your horse has a minor knock or irritation around the eye area, the Horse Care collection may be useful for general yard-side first aid and routine owner care.
Related Questions
Why is my horse squinting one eye but not the other?
Can dust or flies make a horse keep an eye closed?
What should I do if I think something is in my horse’s eye?
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.