8 reasons Why Is My Cat Squinting One Eye

There are a few reasons why your cat’s eyes may water or tear excessively. It could be an early sign of a more serious issue, so it’s important to take notice and seek help from your veterinarian if you suspect something may be wrong. Here are eight possible reasons for your cat’s watering or tearing eyes.

Cat Squinting One Eye
Cat Squinting One Eye

1. An injury or infection in that eye

Your cat may be squinting one eye due to an injury or infection in that eye. There are a few reasons why this can happen. One reason is that the cat’s brain may be trying to protect the injured eye by limiting its movement. This can help to prevent further damage to the eye. Additionally, squinting can help to reduce pain and inflammation in the injured eye. Finally, squinting may also help the cat to better focus on objects with the uninjured eye.

2.”Cherry eye”

“Cherry eye” is a condition that is when the third eyelid (a pink fleshy tissue) prolapses and covers part of the eye. The condition is caused by a prolapse of the third eyelid, which leads to the eye appearing red and irritated. In some cases, the prolapse can be severe enough to cause the eye to become infected, leading to squinting as a way to protect the eye from further irritation. In severe cases, cherry eye can lead to blindness if left untreated. Treatment for cherry eye typically involves surgery to reposition the third eyelid and prevent further prolapse.

3. Allergies

Your cat could be experiencing allergies which make the eyes water and itch, causing them to squint. Allergies can cause inflammation in the eyes, which can lead to squinting. Additionally, allergies can also cause the eyes to produce more tears than normal, which can also lead to squinting. Finally, some allergies can also cause the eyelids to swell, which can also cause squinting.

4.Age-related vision problems

If your cat is a senior citizen, they may be squinting due to age-related vision problems such as cataracts. Cataracts can cause light to scatter in the eye, making it difficult for the cat to see. This can lead to the cat squinting one eye in order to see better. Age-related vision problems such as cataracts are common in older cats. If you notice your cat squinting, it’s important to have them checked out by a veterinarian to rule out any underlying health problems.


Your cat may have developed a tumor on their eye which is causing it to bulge out and appear squinted. The tumor could be causing pain or discomfort in the eye, leading the cat to squint in an effort to alleviate the sensation. Additionally, the tumor could be impacting the cat’s vision, causing them to squint in order to better see. Finally, the tumor could be physically obstructing the eye, leading to squinting as the cat tries to see around it. In any case, if you notice your cat squinting one eye, it is important to have them seen by a veterinarian as soon as possible in order to rule out any potential underlying medical conditions.

6. Conjunctivitis (pink eye)

If your cat’s squinting is accompanied by discharge, it could be a sign of conjunctivitis (pink eye).The conjunctiva (the tissue that lines the inner surface of the eyelid and covers the white part of the eye) becomes inflamed and swollen. This can cause the eyelids to swell shut, making it difficult for the cat to open its eye. Another reason is that the conjunctiva may produce excess mucus, which can cause the eyelids to stick together. Finally, conjunctivitis can be quite painful, and the squinting may be an attempt to relieve some of that discomfort.

7. Glaucoma

Your cat may be squinting in an attempt to relieve pain caused by something like glaucoma. There are a number of reasons why glaucoma can lead to squinting in cats. First, glaucoma can cause increased pressure within the eye, which can damage the optic nerve. This damage can lead to vision loss and even complete blindness. In addition, glaucoma can also cause inflammation and pain within the eye, both of which can lead to squinting. Finally, squinting can also be a sign of an underlying neurological condition that is causing the glaucoma. Treating the underlying condition is often the best way to relieve the squinting.

8. Horner’s syndrome

In rare cases, cats can develop a condition called Horner’s syndrome which affects the nerves around the eye and can cause squinting. Horner’s syndrome can lead to squinting in cats because it affects the third eyelid, which helps protect the eye. When the third eyelid is not functioning properly, the eye is more susceptible to damage and infection. In addition, Horner’s syndrome can also cause the pupil of the affected eye to constrict, which can make it difficult for the cat to see.

What you can do to help relieve your cat’s discomfort?

1. Check for foreign objects in your cat’s eye

If you notice your cat squinting one eye, the first thing you should do is check for any foreign objects that may be causing irritation. This could be something as simple as a piece of dust or a strand of hair. If you see anything in your cat’s eye, gently remove it with a clean cloth.

2. Apply a warm compress

If there is no foreign object in your cat’s eye, the next step is to apply a warm compress. This will help soothe any irritation and reduce swelling. Simply wet a clean washcloth with warm water and hold it against your cat’s eye for a few minutes.

3. Give your cat some eye drops

If the warm compress does not seem to be helping, you may need to give your cat some over-the-counter artificial tears or lubricating eye drops. This will help keep the eye moist and reduce irritation.

4. Take your cat to the vet

If you have tried all of the above home remedies and your cat’s squinting persists, it is time to take them to the vet. There could be a more serious underlying cause, such as an infection or injury.

5. Preventative measures

To help prevent your cat from squinting one eye in the future, try to keep their environment clean and free of dust and other potential irritants. You may also want to consider using artificial tears or lubricating eye drops on a regular basis, especially if your cat has a history of squinting.


If your cat is squinting one eye, it could be a sign of an underlying medical condition. The most common cause is conjunctivitis (pink eye), but it could also be a sign of glaucoma, Horner’s syndrome, or another condition. If you have tried home remedies and the squinting persists, it is time to take your cat to the vet. Once the underlying cause has been treated, the squinting should resolve itself.

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