If your cat’s eyes are looking red, swollen, or just a bit off, don’t brush it aside. This might be a case of feline conjunctivitis.
Cats can get conjunctivitis, which is also called pink eye. It’s one of the most common eye issues in cats. It affects the thin, protective layer of the cat’s eye, known as the conjunctiva. This membrane covers the white part of the eye, keeping it moist and protected from dirt, dust, and pathogens.
In this guide, we’ll break down the common signs of conjunctivitis in cats, what causes it, how it’s diagnosed, and what treatments actually work. We’ll also share tips to help you protect your cat’s eyes going forward.
Key Takeaways
Conjunctivitis in cats is the inflammation of the thin membrane that covers the white part of the eye, resulting in redness, swelling, and discharge.
It can be caused by viruses, bacteria, fungi, irritants, eye trauma, underlying health issues, and several eye conditions.
Cat pink eye can be treated with consistent medication and supportive care.
What Are the Symptoms of Conjunctivitis in Cats?
If you notice any of these signs, seek our help. Here are the clinical signs of pink eye in cats.
Red, swollen eyes. The white part of your cat’s eyes may appear red, and the inner eyelids may look swollen. This signals conjunctival inflammation, an early sign of cat pink eye.
Eye discharge. You may notice a bit of discharge coming from your cat’s eyes. This can be watery, yellow, or green and may come from one or both eyes.
Squinting or excessive blinking. Cats with conjunctivitis often blink and squint due to the constant discomfort they feel. This is a natural response to the irritation.
Sensitivity to light. In some cases, cats will be highly sensitive to bright light, often hiding in dimly lit spots around the house.
Pawing or rubbing at the eyes. Due to the persistent irritation, cats may paw at their eyes or rub them on furniture. This can lead to more damage if left unattended.
Visible third eyelid. The third eyelid may also pop out and become visible. This can have a red and slightly swollen appearance.
When to See Our Vets
Persistent redness and squinting
Significant pain and swelling
Yellow, green, thick, or excessive discharge
Accompanying respiratory symptoms
Symptoms that last for more than 24-48 hours
What Causes Pink Eye in Cats?
Feline conjunctivitis can be caused by pathogens, environmental irritants and allergens, physical trauma, and other underlying diseases.
Infectious Causes
Viral Infections
Viruses are one of the most common reasons why a cat may have conjunctivitis. Common ones include:
Feline Herpesvirus. FHV-1 is the leading cause of conjunctivitis in cats and is extremely contagious. The virus can flare up due to stress, causing a recurrence.
Feline Calicivirus. FCV is another highly contagious virus that easily spreads from the upper respiratory tract to the eyes of cats.
Other viruses. FIV and FeLV are other viruses that may also cause pink eye by compromising the cat’s immune system, making them vulnerable to secondary infections.
Bacterial Infections
These can be primary or secondary infections.
Chlamydia felis. Chlamydia felis directly infects the cat’s conjunctival epithelial cells. It’s easily transmitted in contaminated areas where cats are in close proximity to one another.
Mycoplasma spp.. While these are natural inhabitants of a cat’s eye, they may cause pink eye when they overpopulate.
Other bacteria. Staphylococcus, Streptococcus, Bartonella, and Pseudomonas.
Fungal Infections
Although rare, fungal infections may lead to conjunctivitis, especially in immunocompromised cats. Common ones are:
Aspergillus species. Specifically, Aspergillus fumigatus and Aspergillus niger are linked to feline eye infections.
Candida species. Candida albicans is the most prominent type involved in ocular infections.
Cryptococcus species. Cryptococcus neoformans and Cryptococcus gattii.
Non-Infectious Causes
Some causes of feline conjunctivitis may start with non-infectious causes. These include:
Allergies and Irritants
Cats can develop allergic reactions to dust, smoke, pollen, and other allergens, prompting the immune system to overreact. This leads to redness and inflammation in the eye, which may also make cats want to scratch or paw at it.
Eye Trauma and Foreign Bodies
Scratches, bumps, and debris can directly injure the eye’s delicate lining. This trauma leads to acute inflammation, which may also progress to secondary infections, potentially leading to severe complications.
Underlying Health Conditions
In some cases, conjunctivitis in cats may be due to specific health issues.
Immune-mediated conditions. The immune system may mistakenly attack the cat’s eye tissue.
Dry eye. Decreased tear production can leave the eye vulnerable to irritation, inflammation, injury, and infection.
Corneal and eye diseases. Corneal ulcers, uveitis, and glaucoma can contribute to feline conjunctivitis.
Eyelid disorders. This includes blocked tear ducts, entropion, and eyelid tumors.
How Do Vets Diagnose Conjunctivitis in Cats?
Our process involves a detailed eye exam and a few laboratory tests. Here’s how our eye specialists for pets diagnose the condition.
Eye Examination
Using an ophthalmoscope and other specialized light or magnification tools, our experts thoroughly inspect your cat’s eyes. If your cat’s eyes have conjunctivitis, we’ll see signs of inflammation or infection. These are clues that help us where to proceed next.
Cytology
We take a small sample from your cat’s eye, either discharge or conjunctival cells. Under a microscope, this helps us determine the type of inflammation present and whether bacteria, fungi, or other cells are involved.
Culture and Sensitivity Test
Our vets can also perform a culture and sensitivity test to identify the exact bacteria causing the problem and determine which antibiotics work best. It involves collecting a sample and growing a culture in our in-house laboratory.
Tear Stain Test
A safe orange dye is placed on the eye’s surface, and a special blue light is directed at the eyes. It shows any scratches, ulcers, or hidden damage. The dye washes away after the exam, but helps us see issues that aren’t always visible.
Polymerase Chain Reaction
A PCR test is a highly sensitive test that replicates the genetic material of the pathogens involved, allowing them to be easily identified. It’s a highly accurate test, but it does come at a higher cost.
Other Tests
To rule out other causes, we may do allergy testing, bloodwork, diagnostic imaging, and other tests.
How Is Conjunctivitis in Cats Treated?
Once conjunctivitis has been diagnosed in your cat, we’ll proceed to treatment. Because of the variety of causes, the options for treating pink eye in cats will vary as well.
Medications
Antibiotic drops or ointments are used to treat bacterial conjunctivitis in cats and may include Terramycin, Vetropolycin, and Tobramycin. For viral infections, antivirals such as famciclovir and cidofovir may be used, depending on the specific cause.
Systemic medications are essential in cases of severe infection. To help alleviate symptoms, we may also prescribe anti-inflammatories. If your cat has dry eye, we may use cyclosporine and artificial tears.
Immune Support
Other forms of treatment may be used, including:
L-Lysine. A nutritional supplement that inhibits the growth of the virus and alleviates symptoms.
Serum eye drops. These promote healing and soothe inflammation.
Immune boosters. Strengthens the cat’s natural defenses against infections.
Supportive Care
Regular eye cleaning is recommended to keep the eyes comfortable and reduce pawing. Using an E-collar is also an effective tool to help the eyes recover.
How Long Do Cats Recover?
Cats may generally take 7-14 days to recover, provided they are receiving proper veterinary treatment. It’s crucial to complete the full course of medication, restrict activity, and use an E-collar to prevent your cat from pawing at its eyes.
How to Prevent Pink Eye in Cats?
Sometimes, a few small habits can make a big difference. Follow these simple recommendations:
Take your cat for checkups
Our wellness exams aim to assess your cat’s overall health and detect signs of potential disease before they worsen. This includes conjunctivitis in cats.
Keep vaccinations updated
Viral infections can be difficult to treat, which is why we always recommend staying up-to-date on your cat’s vaccinations.
Clean their space
Wash your cat’s bedding and pillows regularly. Sanitize their litter box weekly and keep their home clean.
Groom your cat regularly
Grooming cleans the coat, removing bacteria, allergens, and debris, keeping the eyes safe from irritants.
“Bright, clear eyes are a sign of a healthy cat. Protecting them means protecting your cat’s comfort and happiness.”
- Dr. Lidija Krvavac
Final Thoughts
Conjunctivitis in cats is a common eye problem that can cause significant pain and discomfort. While the issue can be managed and treated, it’s always important to take steps to prevent anything from getting in the way of your cat’s health and happiness.
Frequently Asked Questions
Is conjunctivitis painful for cats?
Yes, it’s very painful and uncomfortable for cats, causing them to scratch their eyes and blink excessively. It’s often accompanied by swelling, redness, and discharge.
Can cat pink eye heal on its own?
Mild cases may do, but it’s very risky to wait. It’s best to provide veterinary care as soon as possible to help your cat recover.
Is conjunctivitis in cats contagious?
Yes, it’s highly contagious, capable of easily spreading to nearby cats, especially in crowded areas. It can spread through direct contact and contaminated environments.
Can humans get pink eye from cats?
Yes, but it’s very rare. This is because the main pathogens that cause conjunctivitis in cats are species-specific, meaning they can only affect cats.
What is the prognosis for a cat with conjunctivitis?
The prognosis is good to excellent with veterinary treatment. Cats often start showing signs of improvement after 7 days.
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