Keratitis in Cows

Quick Answer
  • Keratitis in cows usually refers to inflammation of the cornea and is commonly part of infectious bovine keratoconjunctivitis, often called bovine pinkeye.
  • Common early signs include squinting, tearing, light sensitivity, and a cloudy or blue-white spot in the center of the eye.
  • See your vet promptly if a cow has a painful eye, a visible ulcer, marked cloudiness, or reduced vision. Early treatment can reduce pain, limit spread in the herd, and improve healing.
  • Flies, dust, tall seed heads, ultraviolet light, and eye irritation often work together with infectious organisms such as *Moraxella bovis* to trigger disease.
  • Typical 2025-2026 U.S. cost range for an uncomplicated case is about $75-$250 per animal for exam, restraint, and basic treatment. More severe cases needing repeated treatment, patches, or surgery can range from $250-$1,000+.
Estimated cost: $75–$1,000

What Is Keratitis in Cows?

Keratitis means inflammation of the cornea, the clear front surface of the eye. In cows, keratitis is often part of infectious bovine keratoconjunctivitis (IBK), commonly called pinkeye. This condition affects the cornea and surrounding eye tissues, causing pain, tearing, squinting, and a cloudy or opaque appearance.

In many cattle, the first important lesion is a central corneal ulcer. That ulcer can start small, then become more opaque over hours to days. Mild cases may heal with early care, but deeper ulcers can lead to scarring, poor vision, or even rupture of the eye.

Keratitis is not only a comfort issue. Pain can reduce grazing time and weight gain, and affected cattle may spread infectious material to herd mates. Calves and young stock are often affected more often, especially during warm months when flies and environmental irritation are at their peak.

Symptoms of Keratitis in Cows

  • Excessive tearing or wetness below the eye
  • Squinting or tightly closed eyelids
  • Sensitivity to sunlight or bright light
  • Red or inflamed conjunctiva around the eye
  • Cloudy, blue, white, or hazy cornea
  • A visible central ulcer or spot on the cornea
  • Mucus or pus-like eye discharge in more advanced cases
  • Reduced appetite, slower grazing, or isolation due to eye pain
  • One or both eyes affected
  • Vision loss, bulging, or suspected rupture in severe cases

Early keratitis often starts with tearing, squinting, and light sensitivity. As inflammation worsens, the cornea may look hazy, then blue-white or milky. In more serious cases, discharge becomes thicker, blood vessels may grow into the cornea, and the animal may seem partly blind in the affected eye.

See your vet immediately if the eye looks very cloudy, the cow cannot open it, you see a deep ulcer, the surface appears to bulge, or vision seems reduced. Severe corneal ulcers can perforate, and delayed care can lead to permanent blindness.

What Causes Keratitis in Cows?

In cattle, keratitis is most often linked to infectious bovine keratoconjunctivitis. The main bacterial agent associated with classic bovine pinkeye is Moraxella bovis. Other organisms, including some Moraxella species, Mycoplasma species, and bovine herpesvirus type 1, may also contribute in some herds.

Usually, infection is only part of the story. The cornea often becomes vulnerable after irritation from face flies, dust, ultraviolet sunlight, tall seed heads, foxtails, or other plant awns. These factors can scratch or stress the eye surface, making it easier for infectious organisms to attach and spread.

Herd-level risk also matters. Outbreaks are more common in warmer months, in young cattle, and when animals are commingled during transport, sales, or shows. Some cattle with less pigment around the eyelids may be more sensitive to sunlight, and poor trace mineral status may also increase risk in some situations.

How Is Keratitis in Cows Diagnosed?

Your vet usually starts with a physical exam and a close eye exam. In many cases, keratitis or pinkeye is diagnosed presumptively from the clinical signs, especially when there is tearing, squinting, conjunctivitis, and a central corneal ulcer or opacity.

A key part of diagnosis is checking for problems that can look similar or make the case worse. Your vet may look for foreign bodies, plant material, parasites such as Thelazia, trauma, infectious bovine rhinotracheitis, or other eye diseases. This matters because treatment choices and prognosis can change if the ulcer is deep or if another disease is involved.

In herd outbreaks, recurrent cases, or poor treatment response, your vet may recommend culture, cytology, or molecular testing from eye samples. These tests can help identify which organisms are present and support herd-level treatment and prevention planning.

Treatment Options for Keratitis in Cows

Spectrum of Care means you have options. Here are treatment tiers at different price points.

Budget-Conscious Care

$75–$180
Best for: Early, mild-to-moderate cases in cattle that can be handled safely and do not show deep ulceration, rupture, or severe vision loss.
  • Farm-call or chute-side exam
  • Basic eye assessment for pain, ulcer, and severity
  • Early treatment of uncomplicated cases under your vet's direction
  • Systemic antibiotic commonly used in field settings when appropriate
  • Eye patch or shade-based protection when suitable
  • Immediate fly-control and pasture-irritant reduction
Expected outcome: Often good when treated early. Many uncomplicated cases improve over several days, though some scarring can remain.
Consider: Lower upfront cost and practical herd use, but less diagnostic detail. It may miss contributing organisms or deeper damage, and some cattle need follow-up or escalation.
Most Common

Recommended Standard Treatment

$150–$350
Best for: Most cattle with active keratitis or pinkeye, especially when there is obvious corneal cloudiness, ulceration, pain, or more than one affected animal.
  • Full veterinary eye exam with closer ulcer assessment
  • Targeted antimicrobial plan based on severity, label use, and food-animal considerations
  • Eye patch or protective treatment when indicated
  • Pain and inflammation discussion with your vet when appropriate
  • Recheck plan for healing progress
  • Herd-level prevention review including flies, shade, weeds, and vaccination strategy
Expected outcome: Good to fair depending on ulcer depth and how quickly treatment starts. Early standard care usually gives the best chance of comfort, healing, and reduced spread.
Consider: More handling and higher cost range than conservative care, but it gives better monitoring and a more complete plan. Withdrawal times and treatment records are especially important in food animals.

Advanced / Critical Care

$350–$1,000
Best for: Deep ulcers, severe corneal opacity, suspected perforation, recurrent herd outbreaks, treatment failures, or cattle with major vision compromise.
  • Detailed ophthalmic assessment for deep ulcer, perforation, or rupture risk
  • Culture or other diagnostic sampling in recurrent or resistant herd cases
  • Subconjunctival treatment or more intensive procedures when your vet recommends them
  • Temporary tarsorrhaphy, third-eyelid flap, or other protective procedures in selected cases
  • Surgical salvage or enucleation for non-visual, ruptured, or severely damaged eyes
  • Structured herd investigation for outbreak control
Expected outcome: Variable. Some eyes heal with scarring, while advanced damage can lead to permanent blindness in that eye. Prompt escalation can still improve comfort and preserve function in selected cases.
Consider: Highest cost range and labor needs. These cases often require stronger restraint, repeat visits, and more downtime, but advanced care may prevent prolonged pain or loss of the eye.

Cost estimates as of 2026-03. Actual costs vary by location, clinic, and individual case.

Questions to Ask Your Vet About Keratitis in Cows

Bring these questions to your vet appointment to get the most out of your visit.

  1. Does this eye look like early pinkeye, a deep ulcer, trauma, or something else?
  2. How urgent is treatment for this cow, and does the eye need a patch or another protective procedure?
  3. Which treatment options fit this animal and our herd goals, including conservative, standard, and more advanced care?
  4. Are there food-animal withdrawal times or record-keeping steps I need to follow with this treatment?
  5. Should we culture affected eyes or do other testing because cases are recurring or not responding?
  6. What fly-control methods are most likely to help on our farm right now?
  7. Would clipping seed heads, adding shade, or changing pasture management likely reduce new cases?
  8. Is a commercial or autogenous pinkeye vaccine worth considering for our herd history?

How to Prevent Keratitis in Cows

Prevention focuses on lowering the eye irritation and infection pressure that allow pinkeye to take hold. The most helpful steps usually include face fly control, reducing dust, clipping tall seed heads and weeds, and providing shade during high-risk months. Frequent observation also matters because early treatment can reduce pain and may limit spread within the herd.

Face flies are especially important because they irritate the eye and can carry infectious material from one animal to another for a short time. Many herds do best with a combined fly-control plan, such as insecticide ear tags, forced-use dust bags or oilers, and feed-through insect growth regulators started before peak fly season. Your vet can help tailor this to your operation.

Vaccination may help some herds, but results are mixed. Commercial and autogenous pinkeye vaccines are available, yet protection is not consistent across all herds. If keratitis is a recurring problem, talk with your vet about whether vaccination, culture-based herd planning, trace mineral review, and management changes together make the most sense.

Find a Vet Near You