---
title: "Why Is My Cat Squinting One Eye?"
canonical: "https://catcomfortshop.com/cat-keeping-one-eye-closed-squinting-one-eye/"
author: "Steffan"
published: "2026-10-10T03:00:00+00:00"
modified: "2026-09-18T11:59:18+00:00"
language: "en-US"
site: "Cat Comfort Shop"
description: "Your cat is squinting one eye and keeping it closed. That's not a drama queen move, it's a medical sign. When a cat keeps one eye shut, something is…"
categories: "Uncategorized"
attribution: "Cat Comfort Shop (https://catcomfortshop.com/)"
---

# Why Is My Cat Squinting One Eye?

Your cat is squinting one eye and keeping it closed. That's not a drama queen move, it's a medical sign. When a cat keeps one eye shut, something is actively bothering that eye, and your job is to figure out how urgent it is without panicking or ignoring it.

 

The medical term for this is blepharospasm, and it's a reflex. It means the eye hurts, feels irritated, or is trying to protect itself from further damage. As of 2026, veterinary ophthalmology guidelines still treat a persistently closed eye as a top-priority triage symptom, not a cosmetic quirk.

 

In our research, we've seen this exact symptom trace back to everything from a stray eyelash to a vision-threatening glaucoma attack. The good news is you can learn to spot the difference, and this guide walks you through exactly what to look for and what to do next.

 

## Quick Answer

 

A cat keeping one eye closed and squinting is showing a clear sign of eye pain, irritation, or injury. Common causes include corneal ulcers, feline herpesvirus, foreign bodies, or glaucoma. Do not wait to see if it resolves on its own.

 

Examine the eye, check for red flags, and contact your vet the same day for an urgent appointment.

 

---

 

## Why This Needs Immediate Attention

 

Here's the thing about cat eyes: they heal fast when the problem is small, and they scar fast when you wait. A squinting eye is a red flag, not a waiting game. If your cat is keeping one eye closed and squinting the other, something is actively irritating that cornea right now.

 

You have a 24-hour window in most mild cases before a minor scratch turns into a deeper ulcer. That's not a scare tactic, it's just how feline eye anatomy works. The cornea has only two layers of cells protecting the inner chamber.

 

Once those break down, fluids leak, pressure changes, and the eye can permanently lose vision.

 

Signs that make this genuinely urgent:

 

- The eye looks cloudy, bluish, or hazy
- The third eyelid is covering half the eye
- The pupil is tiny compared to the other eye
- The eyeball itself looks sunken or swollen
- There's green or yellow discharge, not just clear tears

 

If you see any of those, stop Googling and call your vet. We mean it. If you're just seeing squinting with clear tearing, you still have a same-day vet visit ahead of you, but you have a few hours to breathe and plan.

 

The biggest mistake owners make is assuming some eye drop from the pharmacy will fix it. That's how we see cats with chemical burns on their corneas from people using human Visine or steroid drops without a vet's approval. Never put anything in your cat's eye that isn't prescribed by a vet for that specific eye.

 

## The 3 Most Common Causes of Squinting in Cats

 

When you bring your cat in squinting, the veterinarian will run through a short list of usual suspects. Knowing what they are helps you answer their questions better and understand why they recommend certain treatments.

 

**1. Corneal ulcer (scratched or abraded cornea)**

 

This is the most common cause we see. A corneal ulcer is basically a scrape on the surface of the eye. It happens when your cat rubs her face on furniture, catches a claw, or gets a bit of dust under her eyelid.

 

The ulcer itself is painful because the cornea is loaded with nerve endings. Your cat will squint, tear up, and may paw at her face.

 

**2. Feline herpesvirus (FHV-1)**

 

You read that right, cats get herpes. FHV-1 is a respiratory and ocular virus that most stray and shelter cats carry. When stressed or when their immune system dips, the virus flares up and causes conjunctivitis and corneal ulcers.

 

If your cat has sneezed recently, has a clear or slightly colored nasal discharge, or has had eye issues before, herpes is a strong suspect.

 

**3. Foreign body or trauma**

 

Sometimes it's simpler than you'd think. A grass seed, a splinter, a bit of carpet fiber, even a rough play session where a paw connected. If your cat goes outside or lives with another cat who plays rough, a foreign body can cause a sudden squint.

 

The eye is trying to protect itself from something that's actually still stuck in there.

 

**4. Glaucoma (less common but serious)**

 

Glaucoma is the one that scares vets. It's increased pressure inside the eye, and it's painful and vision-threatening. The eyeball might look larger or bulged, the cornea may look blue, and your cat might be hiding or losing appetite.

 

This progresses fast and needs emergency treatment for a chance at saving vision.

 

Here's a quick comparison of what you're dealing with:

 

| Condition | Typical Signs | Urgency |
| --- | --- | --- |
| Corneal ulcer | Squint, clear tearing, mild redness | Same day |
| Feline herpesvirus | Squint, sneezing, discharge, repeated episodes | Same day |
| Foreign body | Sudden onset, pawing, pain when touched | Same day |
| Glaucoma | Cloudy eye, dilated pupil, bulging, head shyness | Emergency (hours) |

 

That table isn't exhaustive, but it gives you a snapshot of what the vet is weighing when you call.

 

## How to Tell If It's an Emergency (Red Flag Checklist)

 

Not every squinting cat needs a 2 AM emergency vet trip, but some do. Before you call anyone, do a slow, careful look at the eye. Here's the difference between "make an appointment tomorrow" and "drop everything now."

 

![feline glaucoma red flag signs](https://catcomfortshop.com/wp-content/uploads/2026/09/feline-glaucoma-red-flag-signs-mu6itiqi.webp)

 

Image source: Bing (Web (fair-use with source credit))

 

**This warrants an emergency vet visit, not a regular appointment:**

 

- You cannot see the surface of the eye clearly through cloudiness or a blue tinge
- The eyeball looks larger than the other one
- Your cat is pawing aggressively at her face
- She's hiding, refusing food, or unusually aggressive
- The pupil doesn't respond to a flashlight in the squinting eye
- There's blood anywhere in the eye or around the lids
- One eye suddenly is bulging or the cat has trouble opening her mouth

 

**This means schedule a same-day visit but it can wait a few hours:**

 

- Clear tearing and squinting with a normal-looking eyeball
- Your cat is eating, using the litter box, and behaving normally otherwise
- The eye has a small amount of clear discharge
- She's otherwise playful and interactive

 

Here's what we tell owners: listen to your gut. If your cat is usually social and now she's hissing at everything, that's pain. If the eye looks weird and you're not sure, go to the emergency clinic.

 

A feline opthalmology consult runs about $150 to $300, but a missed glaucoma diagnosis can cost your cat an eye.

 

One thing we can't stress enough: don't wait out a closed eye for "a day or two to see what happens." That's exactly how a minor scratch becomes a permanent scar.

 

## Safe First Aid Before the Vet Visit

 

So you've checked the eye, it's not a squirt-blood emergency, and you've got a vet appointment later today. Great. Now here's what you can do at home to keep your cat comfortable without making things worse.

 

First, resist the urge to rinse the eye with anything. No saline, no contact lens solution, no tap water. You don't know what's causing the squint yet, and the wrong liquid can increase irritation or push debris deeper.

 

If you have a clear eye lubricant like artificial tears without preservatives, a single drop can soothe a dry surface. But if you have to think twice about whether the product is safe for cats, skip it.

 

Second, keep your cat calm and dim the lights. Cats naturally shrink their pupils in bright light, and when the eye is already painful, a bright room can make the squinting worse. Close the curtains, turn off the overhead light, and let her rest in a quiet room.

 

Third, prevent pawing. If your cat keeps pawing at her eye, she can scratch her cornea more. It's not cruel to put an E-collar on her while you wait for the vet.

 

If you don't have one, you can DIY a paper plate collar or even a rolled cardboard cone. The point is to stop the paw-eye contact.

 

![cat keeping one eye closed squinting one eye](https://catcomfortshop.com/wp-content/uploads/2026/09/cat-keeping-one-eye-closed-squinting-one-eye-mu6itjcj.webp)

 

Image source: Bing (Web (fair-use with source credit))

 

Don't apply any warm compresses unless your vet specifically recommends it. Warm compresses help with certain kinds of blocked tear ducts or eye infections, but they can also spread bacteria if you're dealing with something like pink eye. The safest move is to do nothing except keep her comfortable and get her to the vet.

 

Also pay attention to what you touch afterward. Wash your hands well after handling your cat's face. If this is a herpes flare-up, the virus can linger on your clothes and hands.

 

We're not saying you need to quarantine your cat, but if you have multiple cats, keep the squinting one separate until the vet confirms it's not contagious.

 

## What the Vet Will Do: Diagnostic Steps Explained

 

When you walk into the vet clinic with a squinting cat, you're not going to get a wild guess. The vet will walk through a set of diagnostic steps designed to identify the cause of pain and rule out blindness. Here's what typically happens.

 

First comes the physical exam, starting with the face. The vet will look at the outside of the eye, check the eyelids for inward rolling or growths, and gently examine the third eyelid. They'll also check the pupil's response to light.

 

That's the quick measure of whether the retina and optic nerve are working.

 

Next is the fluorescein eye stain test, which catches corneal ulcers. The vet puts a drop of orange dye on the eye, asks your cat to blink a few times, and then shines a blue light on the eye.

 

![fluorescein stain test cat eye](https://catcomfortshop.com/wp-content/uploads/2026/09/fluorescein-stain-test-cat-eye-mu6itk3a.webp)

 

Image source: Bing (Web (fair-use with source credit))

 

The dye glows bright green where the cornea is damaged. If you've ever had a scratched eye, it looks the same on a cat. The dye shows up on the surface of the ulcer, and it's the best way to confirm a scratch or identify an ulcer that needs medication.

 

After the stain, the vet will likely measure intraocular pressure with a tool called a tonometer. It's a small pen-like device that presses against the eye. It sounds scary, but it's quick and essential for ruling out glaucoma.

 

This is the test that tells you whether the eye pressure is too high, which is an emergency.

 

If the stain comes back clean and the pressure is normal, the vet might tap the cornea with a sterile swab to check for herpesvirus. That swab gets sent to a lab for an antigen test. It doesn't always come back positive even when herpes is there, so sometimes the vet will just treat under the assumption it's a viral flare.

 

Finally, if there's a foreign body like a grass seed, the vet will try to see it and remove it. That might require numbing drops and fine forceps. In rare cases, the vet will refer you to a board-certified veterinary ophthalmologist for exam under anesthesia.

 

That usually means a quick procedure where they can fully examine the eye, flush the tear ducts, and take samples from inside the eye if needed.