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Eye Problems in Horses
Signs to watch for, and when it’s an emergency
Quick Answer
- A horse’s eye is delicate, and most problems are worth taking seriously rather than waiting to see
- Mild discharge or watering can be linked to dust, flies, or minor irritation
- A squinting, painful, or cloudy eye needs prompt veterinary assessment
- Never apply anything to a horse’s eye without veterinary guidance
Signs to Watch For
- Watery or thickened discharge from one or both eyes
- Squinting, or holding the eye partly or fully closed
- Redness or visible swelling around the eye
- A cloudy, blue, or hazy appearance to the surface of the eye
- Rubbing the eye against a leg, fence, or other surface
- Sensitivity to bright light
Common Causes
01 Conjunctivitis or general irritation Common
Dust, pollen, wind, or fly worry can be linked to mild redness and watering, often affecting both eyes.
02 Foreign body
A piece of grass seed, hay, or grit can become trapped under the eyelid and cause sudden discomfort and squinting.
03 Corneal injury or ulcer Urgent
A scratch or ulcer on the surface of the eye can be linked to significant pain, squinting, and cloudiness, and can worsen quickly without treatment.
Corneal ulcers can progress rapidly — same-day veterinary assessment is important.
04 Uveitis
Inflammation inside the eye can be linked to recurring episodes of pain, cloudiness, and light sensitivity, and may need ongoing veterinary management.
Contact Your Vet Immediately
- An eye held fully closed and clearly painful
- Sudden cloudiness or a visible blue-white haze over the eye
- A visible foreign object lodged in or around the eye
- Any injury to the eye itself, including from a kick or collision
Eye injuries can worsen quickly — don’t wait to see if it settles on its own.
Avoid
Don’t Do This
- Don’t try to remove an embedded foreign body yourself
- Don’t apply any human eye drops, ointments, or remedies without veterinary direction
- Don’t force the eyelid open if your horse is resisting strongly — let your vet assess it
When to Contact Your Vet
- Mild discharge or watering that persists for more than a day or two
- Recurring squinting or sensitivity to light
- Any swelling around the eye that doesn’t settle quickly
- A previous history of eye problems showing early signs again
How Pet Med Direct Can Help
Once your vet has diagnosed the cause, ongoing treatment may include prescribed eye drops or ointments tailored to the specific condition.
Eye treatments require a valid veterinary prescription. Pet Med Direct can only supply prescription medicines after the prescription has been checked. Always follow your vet’s advice and the directions on the medicine label.
Frequently Asked Questions
Can fly masks help prevent eye irritation?
Yes, a well-fitted fly mask can reduce irritation from flies, dust, and UV exposure, which may help lower the risk of minor eye irritation.
Is one watery eye more concerning than two?
Not necessarily on its own, but a single affected eye is more often linked to a localised cause, such as a foreign body or injury, so it’s worth a closer look.
Can eye problems affect a horse’s behaviour under saddle?
Yes, pain or reduced vision in one eye can affect confidence and responsiveness while riding, so any change in behaviour alongside eye signs is worth mentioning to your vet.
How quickly can a corneal ulcer get worse?
Corneal ulcers can deteriorate within hours in some cases, which is why same-day veterinary assessment is recommended for a painful or cloudy eye.
Need pet products or prescription medicines? Visit the Pet Med Direct shop.
This this article is for informational purposes only and does not constitute veterinary advice.
If you are concerned with your dog’s health, please consult a qualified veterinarian.