Cloudy Eyes in Cats: Causes, Symptoms, and When to Worry

Cloudy eyes in cats are a common symptom that can indicate anything from mild irritation to serious eye disease.

Eye problems are among the most frequent health concerns in cats, and a cloudy appearance is often one of the first signs noticed by pet parents.

Conditions that cause eye cloudiness can range from mild to severe. Cats of all ages may develop cloudy eyes, although the underlying causes often differ depending on life stage.

Causes of Cloudy Eyes in Cats

Cloudy eyes in cats can be caused by a variety of conditions affecting different parts of the eye, ranging from normal aging changes to serious diseases that can lead to vision loss.

Cataracts

Cataracts occur when the lens becomes cloudy, interfering with light reaching the retina and leading to blurred vision or blindness if untreated.

They can affect cats of any age but are more common with:

• Eye trauma
• Uveitis (inflammation inside the eye)
• Systemic diseases (such as diabetes, viral infections, or hypertension)

Certain breeds, including British Shorthairs and Himalayans, may be predisposed.

Nuclear Sclerosis (Lenticular Sclerosis)

Nuclear sclerosis is a normal age-related change where a blue-tinged haze develops in the lens. It is commonly mistaken for cataracts and is a normal change that happens as cats age. 

Lenticular sclerosis usually does not severely affect vision, though it can affect depth perception and tends to be slowly progressive in both eyes.

Glaucoma

Glaucoma occurs when fluid cannot drain properly from the eye, causing increased pressure. This leads to pain, eye enlargement (bulging), and vision loss or blindness.

Glaucoma can affect one or both eyes, and is more common in cats over 8, but can occur at any age. 

Primary glaucoma is rare in cats but may be inherited in breeds such as Burmese and Siamese cats. In most cases, glaucoma is secondary to uveitis or systemic disease.

Signs of glaucoma may include:

• Redness
• Excessive blinking
• Tearing
• Discomfort

Corneal Ulceration

Corneal ulcers occur when the outer layer of the eye is damaged. The most common cause of corneal ulceration is trauma, but it can also be caused by chemical exposure, infection, or other rarer conditions.

Common signs include:

• Pain and squinting
• Excessive blinking
• Increased tearing or discharge

Severe ulcers can lead to swelling, rupture, or loss of the eye if untreated.

Mild cases of corneal ulceration are often treated with eye medications and Elizabethan collars to avoid rubbing. More severe cases can sometimes require surgical therapy.

Keratitis

Keratitis is inflammation of the cornea and may be:

• Ulcerative (associated with corneal damage)
• Eosinophilic (chronic inflammatory condition)

Symptoms often include:

• Squinting
• Discharge
• Swelling
• Eye rubbing

Both types of keratitis are often treated with a long course of eye medication based on the underlying cause, if found.

Ulcerative keratitis is most often seen in exotic breeds such as Himalayans and Persians. It can often lead to corneal ulceration.

Eosinophilic keratitis often appears as raised pink, gray, or white lesions and is more common in cats under 4 years old.

Uveitis

Uveitis is inflammation of the uvea (iris, ciliary body, and choroid), which can lead to reduced eye pressure and a decrease in fluid production.

Signs of uveitis include:

• Cloudiness
• Squinting
• Discharge

Possible causes include:

• Infectious diseases (viral or tick-borne)
• Trauma
• Cancer
• Immune-mediated disease

In some cases, no underlying cause is identified.

Corneal Sequestrum

Corneal sequestrum occurs when part of the cornea becomes damaged and rejected by surrounding tissue, leading to:

• Increased corneal blood vessels
• Dark or pigmented discoloration
• Cloudiness
• Eye irritation and rubbing

It is more common in Persians, Himalayans, and Burmese cats.

While early stages may not be painful, the condition can become painful over time. Treatment often involves surgical removal, though mild cases may respond to medication.

What To Do if Your Cat's Eyes Are Cloudy

Determining whether cloudy eyes in cats are an emergency depends on how quickly the symptoms appear and whether other signs are present.

If the cloudiness develops gradually and affects both eyes without other symptoms, you can typically schedule a veterinary appointment for evaluation.

However, seek veterinary care immediately if the cloudiness is sudden or accompanied by any of the following:

• Pain or squinting
• Excessive tearing
• Swelling or bulging of the eye
• Redness
• Yellow, green, or bloody discharge
• Lethargy
• Vomiting or diarrhea
• Weakness
• Swollen joints or lameness
• Fever
• Loss of appetite

Many eye conditions can worsen quickly without treatment and may lead to vision loss or even rupture of the eye. If you are unsure, or if your cat appears uncomfortable, it is best to have them evaluated as soon as possible

What To Check for With Cloudy Eyes in Cats

When a cat has cloudy eyes, observing specific details at home can help determine how serious the issue may be and guide your veterinarian’s diagnosis.

Before your appointment, take note of the following:

• Location of the cloudiness: Is it in one small area or covering the entire cornea (outer layer of the eye)?
• Depth of the cloudiness: Does it appear in front of the pupil (black center) or behind it?
• One eye or both: Is the cloudiness affecting one eye or both eyes?
• Vision changes: Does your cat seem to have trouble seeing—such as bumping into objects, hesitating to jump, or avoiding dark areas?
• Eye discomfort: Is there squinting, excessive blinking, or signs of pain?
• Discharge or tearing: Is there excessive tearing or abnormal discharge (green, yellow, or bloody)?
• Swelling or bulging: Does either eye appear enlarged or protruding?
• Other symptoms: Are there additional signs such as sneezing, congestion, lethargy, decreased appetite, vomiting, diarrhea, or weight loss?

How Vets Diagnose the Cause of Cloudiness in Cats’ Eyes

Veterinarians diagnose cloudy eyes in cats using a combination of physical examination and targeted diagnostic tests.

The first step is a thorough medical history and physical exam to check for signs of systemic disease. Based on initial findings, your veterinarian may recommend the following tests:

• Corneal stain: A dye is applied to the eye to detect abrasions or ulcers on the cornea.
• Intraocular pressure (tonometry): Measures pressure inside the eye to help diagnose conditions such as glaucoma or uveitis.
• Bacterial culture: A sample from the eye is grown in a laboratory to identify bacterial infections.
• Cytology: Examines cells from the eye under a microscope to evaluate inflammation or infection.
• Bloodwork and urinalysis: Used to assess overall health and identify systemic diseases.
• Tick-borne disease testing
• Viral testing

In some cases, additional imaging—such as radiographs (X-rays) or abdominal ultrasound—may be recommended to investigate underlying systemic conditions.

Referral to a veterinary ophthalmologist is often advised for cases that are severe, sudden, rapidly progressing, or not responding to treatment

How Do You Treat Cloudy Eyes in Cats?

Treatment for cloudy eyes in cats depends entirely on the underlying cause and often requires veterinary care.

There are no safe over-the-counter treatments for eye cloudiness in cats. If you notice changes in your cat’s eyes, prevent them from rubbing or scratching, as this can worsen irritation or cause further injury. An Elizabethan collar (E-collar) may be used until your cat can be evaluated by a veterinarian.

Common Treatments by Cause

Cataracts

Cataracts cannot be treated with medication. Management may include eye drops and treating underlying conditions, but surgery is the only curative option if vision is still present.

Nuclear sclerosis (lenticular sclerosis)

Treatment is usually not necessary. In some cases, omega fatty acid supplementation (under veterinary guidance) may help slow progression.

Glaucoma

There is no cure, so treatment focuses on managing pain and reducing eye pressure. This may include:

• Medicated eye drops
• Oral pain medication
• Surgical options (such as shunts or, in severe cases, eye removal)

Corneal ulceration

Treatment depends on severity. 

Mild cases often respond well to eye antibiotics and anti-inflammatory medication. More severe cases may require grid keratectomy or surgical conjunctival grafting to repair the defect in the cornea.

Keratitis

Treatment varies based on cause and severity and may include:

• Anti-inflammatory or steroid eye drops
• Antiviral medications
• Systemic therapy in more complex cases

Uveitis

Treatment typically includes anti-inflammatory medications (often steroids) and addressing the underlying cause. Long-term control depends on managing the primary disease.

Corneal sequestrum

Mild cases can be treated with antibacterial and anti-inflammatory eye drops while the body dissolves the dying corneal tissue. More severe cases may require surgical removal.

Many eye conditions can worsen quickly and lead to vision loss if untreated, so early diagnosis is critical. If your cat develops sudden cloudiness or shows signs of pain or discharge, seek veterinary care as soon as possible.