Hereditary Entropion in Sheep: Inward Eyelids in Lambs
- Hereditary entropion is an inward-rolling eyelid, usually noticed at birth or within the first few days of life.
- The rolled lid makes wool, lashes, or skin rub on the eye, which can cause pain, tearing, cloudiness, ulcers, and permanent corneal scarring if treatment is delayed.
- Many mild cases can be managed early with eyelid eversion or temporary tacking or clips, but lambs with corneal damage or persistent eyelid rolling should be seen by your vet promptly.
- Because this condition has a hereditary component in sheep, affected lambs should be recorded and generally not kept as breeding replacements.
What Is Hereditary Entropion in Sheep?
Hereditary entropion is a condition where the eyelid margin rolls inward, so the wool, eyelashes, or skin rub against the surface of the eye. In lambs, the lower eyelid is often affected, and one or both eyes may be involved. It is usually noticed at birth or within the first few days of life.
That inward rolling irritates the conjunctiva and cornea. Lambs may squint, tear, and keep the eye partly closed. If the rubbing continues, the cornea can become cloudy, ulcerated, or scarred. Early treatment matters because the longer the eye is irritated, the higher the risk of lasting vision damage.
In sheep, entropion is widely recognized as a heritable conformational problem, although some lambs can also develop a spastic or secondary inward roll when eye pain, dehydration, or enophthalmos are present. That is one reason your vet may look at the whole lamb, not only the eyelid, before recommending a plan.
Symptoms of Hereditary Entropion in Sheep
- Inward-rolled eyelid margin, often the lower lid
- Squinting or keeping one eye partly closed
- Excess tearing or wet, stained wool below the eye
- Sensitivity to light or obvious eye discomfort
- Redness of the conjunctiva
- Cloudy or blue-white cornea
- Corneal ulcer or visible blood vessels growing across the cornea
- Poor nursing, lethargy, or failure to thrive because the lamb is painful
Check newborn lambs closely, especially in the first few days after birth. A lamb with tearing and squinting may look like it has a minor eye irritation, but a rolled eyelid can keep scraping the cornea every time the lamb blinks.
See your vet promptly if the eye looks cloudy, the lamb will not open it, discharge is increasing, or you suspect an ulcer. Those signs raise concern for deeper corneal injury and a higher risk of permanent scarring.
What Causes Hereditary Entropion in Sheep?
In sheep, entropion is considered a hereditary conformational defect. The eyelid shape and surrounding facial structure make the lid margin turn inward, and the problem can run in families or lines within a flock. Because of that inherited risk, affected lambs are usually not recommended as breeding replacements.
There can also be a secondary or spastic component. Eye pain, corneal irritation, mild dehydration, or enophthalmos can make the eyelid roll inward more strongly. In practice, a lamb may have a hereditary tendency and then look worse once the cornea becomes irritated.
Breed and flock patterns vary, but the key management point is the same: record every affected lamb and review related sires and dams with your vet or flock advisor. Prevention is less about a vaccine or supplement and more about breeding selection plus early newborn checks.
How Is Hereditary Entropion in Sheep Diagnosed?
Diagnosis is usually based on a physical eye exam. Your vet will look for the eyelid margin rolling inward, hairs contacting the cornea, tearing, squinting, and any corneal cloudiness or ulceration. In many lambs, the diagnosis is straightforward once the lid is gently everted and the eye is examined closely.
Your vet may also assess hydration, body condition, and whether the problem seems primary or secondary to another painful eye issue. If the cornea looks damaged, fluorescein stain may be used to check for an ulcer. That matters because a corneal ulcer can change the treatment plan and the urgency.
In flock settings, diagnosis also includes herd-level thinking. If multiple related lambs are affected, that strengthens concern for a hereditary pattern and supports culling decisions for breeding selection.
Treatment Options for Hereditary Entropion in Sheep
Spectrum of Care means you have options. Here are treatment tiers at different price points.
Budget-Conscious Care
- Early newborn eye checks
- Manual rolling of the eyelid outward in very mild cases
- Basic restraint and repeat monitoring over 24-48 hours
- Topical antibiotic eye ointment only if your vet identifies corneal irritation or ulcer risk
Recommended Standard Treatment
- Veterinary eye exam
- Temporary eyelid tacking sutures or surgical staples/clips left in place about 2-3 weeks
- Fluorescein stain or corneal assessment if ulceration is suspected
- Topical medication when corneal irritation or ulceration is present
- Short-term recheck to confirm the eyelid remains everted and the cornea is healing
Advanced / Critical Care
- Urgent veterinary treatment for severe corneal ulceration or marked pain
- Repeat or more complex temporary eyelid correction when first-line tacking fails
- Referral-level ophthalmic exam in complicated cases
- More intensive corneal ulcer treatment and monitoring
- Selected surgical correction only when your vet determines it is necessary and appropriate for the lamb's age and condition
Cost estimates as of 2026-03. Actual costs vary by location, clinic, and individual case.
Questions to Ask Your Vet About Hereditary Entropion in Sheep
Bring these questions to your vet appointment to get the most out of your visit.
- Does this look like true hereditary entropion, or could pain or dehydration be making the eyelid roll inward?
- Is the cornea scratched or ulcerated, and does this lamb need stain testing or eye medication?
- Would manual eversion be reasonable here, or is temporary tacking or clipping the better option?
- How long should the tacking sutures or clips stay in place, and what should I watch for during healing?
- Should I check related lambs or certain ewe and ram lines more closely this season?
- Should this lamb be removed from the breeding pool even if the eye heals well?
- What signs would mean the eye is getting worse and needs an urgent recheck?
- What cost range should I expect if this lamb needs repeat treatment or referral care?
How to Prevent Hereditary Entropion in Sheep
Prevention starts with breeding decisions. Because entropion in sheep has a hereditary component, affected lambs should be recorded in the lambing book and generally not kept for breeding. Many flocks also review the sire and dam involved, especially if more than one related lamb is affected over time.
Good newborn monitoring also helps prevent eye damage, even when it cannot prevent the inherited tendency itself. Check lambs before they leave the jug or lambing pen, and look for squinting, tearing, or a lower lid that appears tucked inward. Early correction can prevent ulcers and long-term corneal scarring.
Supportive flock management matters too. Lambs that are weak, dehydrated, or slow to nurse may show worse eyelid rolling, so prompt colostrum intake, warmth, and close observation are useful. If entropion appears repeatedly in your flock, ask your vet to help you build a practical breeding and newborn-screening plan.