Can glaucoma cause permanent blindness?

If intraocular pressure is not controlled in time, glaucoma can damage the optic nerve and retina, leading to vision loss. Early detection and regular monitoring reduce the risk of blindness — consult your vet promptly if you suspect any symptoms.

What tests will the vet perform to confirm glaucoma?

The vet will typically measure intraocular pressure and examine the cornea and iris with a slit lamp. Ocular ultrasound or advanced imaging may be arranged to evaluate the retina and lens, and blood or urine tests may be performed to rule out systemic causes.

Does glaucoma treatment require long-term medication?

Many glaucoma cases require long-term monitoring and medication to control eye pressure. Severe cases may need surgery or other interventions. The specific treatment plan and follow-up frequency should be guided by your vet's assessment.

How can I help my pet feel more comfortable at home?

At home, prevent your pet from rubbing the eye, provide a quiet and dimly lit resting area, and give prescribed medications on time. Seek immediate veterinary care if symptoms worsen or any acute change occurs.

How much do the tests and treatment usually cost?

Costs vary by clinic and region — ask your vet for an estimate before proceeding.

Disease Guide

Glaucoma in Dogs and Cats: Eye Pain, Vision Changes, Pressure Testing & Care [2025]

Glaucoma is a condition in which elevated intraocular pressure damages the optic nerve. Acute glaucoma is an emergency requiring immediate pressure reduction. Chronic glaucoma requires lifelong medical management or surgery.

Take 1 minute to check the symptoms first

Last updated: 2026/01/05

Pethealthmap Editorial Team

Sources: ACVO, WSAVA, National Taiwan University Veterinary Hospital

When to See a Vet

Seek Emergency Care Immediately

•Rapid enlargement of the eyeball with severe pain on touch
•Sudden complete loss of light response or vision
•Intraocular bleeding or obvious abnormality in pupil shape

Schedule a Clinic Visit Soon (within 24–72 hours)

•Persistent eye swelling lasting more than 24 hours
•Frequent pawing at the eye or continuous squinting
•Noticeably reduced appetite or activity accompanied by eye symptoms

01What Symptoms Indicate a Problem?

Glaucoma most commonly presents with eye swelling, pain, and vision changes. Early signs can be subtle — watch for changes in behaviour and the appearance of the eye.

The eye appears swollen, hazy, or cloudy on the surface
Your pet flinches, cries out, or shows obvious pain when the eye is touched
Increased eye discharge or persistent thick secretions
Clouding or white changes on the cornea or eye surface
Frequent pawing at the eye or tilting the head to avoid light, affecting normal activity

Seek emergency care immediately if you notice the following symptoms:

⚠️ Sudden rapid swelling of the eyeball with severe pain on touch
⚠️ Sudden complete loss of response to light or loss of vision
⚠️ Bleeding inside the eye or obviously abnormal pupil shape

02How to Assess Abnormalities at Home: Observation Tips and When to Seek Emergency Care

Observing and recording whole-body and behavioural changes at home helps your vet quickly understand the progression and possible triggers of the condition.

Note when symptoms first appeared and how they have changed over time
Take close-up video of the eye and the side of the face using your phone
Observe whether alertness, activity level, and responsiveness to the environment have changed
Record any changes in water intake or urination and defecation
If your pet is on any medications or supplements, note the names and frequency
If symptoms worsen, arrange an ophthalmology appointment or emergency visit as soon as possible

03How Will the Vet Make a Diagnosis? Common Examination Items

At the clinic, a thorough ophthalmic examination and full systemic assessment will be performed to identify the cause of pressure changes and whether concurrent conditions are present.

Intraocular pressure measurement

to assess whether eye pressure is elevated

Slit-lamp or loupe examination of the cornea and iris surface

Ocular ultrasound to evaluate the retina and lens

Blood count and biochemistry panel to assess systemic or metabolic causes

Urinalysis to help rule out systemic disease or infection

Advanced imaging or referral to a veterinary ophthalmologist when indicated

04Treatment and Care After Diagnosis: Medications, Dietary Adjustments, and Home Care

Glaucoma treatment may involve medical management, surgery, or long-term monitoring. Regular follow-up after treatment is essential to preserve vision and minimise complications.

Topical and systemic medications to reduce intraocular pressure and relieve pain
Discussion of the benefits and risks of surgery or laser treatment when necessary
Regular recheck appointments to monitor eye pressure and vision after treatment begins
Home care includes preventing your pet from rubbing the eye and providing a quiet resting environment
Dietary management and control of chronic conditions can support overall treatment
Long-term follow-up at a veterinary ophthalmology referral centre is recommended

05What to Prepare Before the Appointment: Key Information to Help Your Vet

Write down a timeline of when symptoms started, how they have changed, and any possible triggers

Bring recent phone videos and close-up photos of the eye

Record any changes in appetite, water consumption, and urination or defecation

Prepare a list of current medications, supplements, and dosages

If you have previous test results or imaging, bring them along

Call ahead to book an ophthalmology appointment slot to reduce waiting time

This content is for reference only and cannot replace a professional veterinary diagnosis. If your pet shows signs of illness, please seek veterinary care promptly.