# Glaucoma in Cats: Symptoms, Treatment, and Life Expectancy Glaucoma in cats treatment aims to lower the pressure inside the eye, control pain, and preserve as much vision as possible for as long as possible. The disease is not reversible once it starts, and most cats have already lost some vision by the time owners notice a problem [1]. Treatment can still slow the damage and keep your cat comfortable. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## Quick Answer - Glaucoma means the fluid inside the eye cannot drain, so pressure builds and damages the optic nerve [1]. - Warning signs include a dilated pupil that reacts slowly or not at all, a red or cloudy eye, and a firm eyeball [2]. - Cats often hide eye pain. Watch for squinting, hiding, appetite changes, or rubbing the face [2]. - Treatment may include eye drops, oral medication, laser surgery, or removal of a painful blind eye. - Glaucoma in cats is usually a lifelong condition that needs monitoring, even after surgery. ## What Glaucoma in Cats Actually Is The eye keeps its shape with a clear fluid called aqueous humor. This fluid is made behind the lens and drains out through tiny channels near the front of the eye [1]. When production and drainage fall out of balance, fluid builds up and the pressure inside the eye rises [2]. That pressure pushes on the retina and the optic disk, which is where the optic nerve leaves the eye and carries signals to the brain [2]. Pressure damage to those structures causes vision loss. Once the nerve tissue is damaged, it does not grow back. As one veterinary ophthalmologist puts it, the condition is not reversible, and by the time clinical signs appear, substantial vision loss has already occurred [1]. Glaucoma in cats is less common than in dogs [2]. It can affect one eye or both, depending on the type [1]. ### Primary vs. Secondary Glaucoma Primary glaucoma is inherited and often breed related. Burmese and Siamese cats are among the predisposed breeds, and a cat with primary glaucoma will eventually be affected in both eyes [1]. Primary open-angle glaucoma also occurs on its own in Siamese cats [2]. Secondary glaucoma is far more common. It develops after another eye problem, most often inflammation of the anterior uvea or a tumor inside the eye [2]. Other triggers include a lens that slips out of place, abnormal development of the front of the eye, and complications after cataract surgery [3]. ## Glaucoma in Cats Symptoms: What Owners Notice First Cats are good at masking discomfort, so the earliest clues can be easy to miss. The classic early signs include a dilated pupil that moves slowly or not at all, redness in the whites of the eyes, swelling and cloudiness of the cornea, and an eyeball that feels firm to the touch [2]. Pain is the symptom owners most often overlook. In cats, eye pain usually shows up as behavioral change and occasional soreness around the eye instead of obvious winking [2]. Your cat may become quiet, hide more, eat less, or pull away when you touch the head. As pressure stays high, the eyeball can enlarge, the lens can shift out of position, and the cornea can develop breaks in its surface layer [2]. An enlarged eye is a sign that the problem has been present for a while. If you notice any of these changes, have your cat seen promptly. Other eye conditions can look similar at home, including the problems covered in our guide to [feline ocular diseases and their treatment](/knowledge/veterinary-medicine/clinical-methods/feline-ocular-diseases-common-conditions-treatment). ## Causes and Risk Factors Most feline glaucoma is secondary, meaning another disease started the process. The most common underlying causes are inflammation of the anterior uvea and tumors inside the eye [2]. Chronic uveitis, lens subluxation, anterior segment dysgenesis, and toxic anterior segment syndrome after phacoemulsification have all been documented as causes in cats treated surgically for glaucoma [3]. Lens instability deserves special attention. In a study of 34 cats with presumed primary lens instability, intraocular pressure was elevated above 25 mmHg in 38 percent of eyes at presentation [4]. Among eyes with a subluxated lens that were followed for at least 90 days, 73 percent progressed to full anterior lens luxation within a median of 15 days [4]. That is a fast timeline, which is why a slipping lens needs veterinary attention quickly. Breed and genetics matter for primary disease. Siamese and Burmese cats carry higher risk [2][1]. Age and sex patterns vary by cause. In the lens instability study, cats ranged from 1 to 13 years old with a median of 3 years, and 82 percent were male [4]. ## How Veterinarians Diagnose Glaucoma in Cats Diagnosis starts with a full eye exam. Your veterinarian will check the pupil's response to light, look at the front of the eye with a slit lamp or similar instrument, and examine the back of the eye to see the optic disk and retina [2]. Measuring intraocular pressure is the central test. A tonometer touches the surface of the eye and gives a number in mmHg. Normal values differ between individual cats and between breeds, and pressure naturally runs a bit higher in the morning than in the afternoon in healthy cats [5]. Your veterinarian interprets the reading alongside the exam findings instead of relying on one number. Other tests help identify the cause. Gonioscopy looks at the drainage angle. Ultrasound can show tumors or lens position when the cornea is too cloudy to see through. Blood work may be needed if an underlying systemic disease is suspected. Because glaucoma in cats is often secondary, finding and treating the original problem is part of the diagnostic process. ## Glaucoma in Cats Treatment Options Treatment has two goals. The first is to lower intraocular pressure. The second is to manage pain and decide whether the eye can be saved. Your veterinarian will tailor the plan to the cause, the amount of vision left, and your cat's overall health. ### Medications Eye drops are the first line for many cats. Prostaglandin analogs are commonly used in veterinary ophthalmology. In a study of cats with congenital glaucoma, a single dose of latanoprost or latanoprostene bunod produced a short-lived drop in pressure compared with control eyes [6]. A newer drug, omidenepag isopropyl, lowered pressure in both normal cats and cats with congenital glaucoma in a pilot study, with the effect lasting up to 12 hours in normal cats and from 2 to 8 hours in affected cats [7]. These results matter for owners. Feline eyes often respond to drops for a shorter time than dog or human eyes, so frequent dosing and regular rechecks are common. Your veterinarian will calculate the exact dose and schedule based on your cat's weight, the drug chosen, and how the eye responds. Never adjust drops on your own. Oral medications may be added to bring pressure down faster, especially during a crisis. Diuretics and other systemic drugs are prescribed at doses your veterinarian calculates for your cat. ### Surgery When medication cannot control pressure, surgery is the next step. Several procedures exist, and the best choice depends on the cause and whether vision remains. Endoscopic cyclophotocoagulation, often called ECP, uses a laser to reduce fluid production. In a study of 22 eyes from 15 cats, all cats had lens removal followed by ECP. Pressure was controlled at or below 30 mmHg in 86 percent of cases at three months and 94 percent at one year. Vision was present in 77 percent of cases at three months and 71 percent at one year [3]. Those numbers show that surgery can control pressure well, though some cats lose vision over time. Lens removal is often part of the plan when the lens is unstable or luxated, since a displaced lens both causes glaucoma and blocks drainage [3][4]. For an eye that is blind and painful despite treatment, removing the eye is a valid and humane option. It ends the pain permanently. In dogs with advanced glaucoma, enucleation combined with a custom 3D printed eyeball implant has been described as a way to relieve pain while keeping a normal appearance [8]. Similar cosmetic options may be discussed for cats, though the priority is always comfort. ### What About the Other Eye? If your cat has primary glaucoma, the second eye is at risk and will eventually be affected [1]. Your veterinarian may recommend preventive treatment in the healthy eye. This is one reason regular rechecks matter even when your cat seems fine. ## Recovery, Outlook, and Glaucoma in Cats Life Expectancy Glaucoma itself does not shorten a cat's life. The disease affects vision and comfort, not lifespan. With good control, cats live normal-length lives. The real question is quality of life, and that comes down to pain control and how much vision remains. After surgery, most cats need a recovery period with restricted activity, an Elizabethan collar, and several recheck visits. Pressure is typically monitored at intervals over the first year [3]. Some cats need continued drops after surgery. Vision loss may be partial or complete, and it can happen in one eye or both [1]. Cats adapt to vision loss far better than most owners expect, especially when the change is gradual. Keeping furniture in place, using night lights, and talking to your cat before you touch them all help. The most important long-term task is watching for pain. A blind eye that is comfortable is manageable. A blind eye that is painful is not, and removal is often the kindest choice. If your cat also has other age-related conditions, overall health affects how well any treatment plan works. Our articles on [treatment for kidney failure in older cats](/knowledge/veterinary-medicine/veterinary-technology/treatment-for-kidney-failure-in-older-cats) and the [symptoms of kidney failure in elderly cats](/knowledge/veterinary-medicine/symptom-guides/symptoms-of-kidney-failure-in-elderly-cats) cover how chronic disease changes care decisions in senior cats. ### Glaucoma in Cats Treatment Cost Costs vary widely by region, clinic, and procedure, so no single number applies to every cat. In general, you can expect to pay for the initial exam, pressure testing, and any imaging, then ongoing costs for medications and rechecks. Surgery costs substantially more than medical management and usually includes anesthesia, the procedure itself, and follow-up visits. Ask your veterinarian for a written estimate before treatment starts, and ask about payment plans or pet insurance coverage. Treating one eye is usually less expensive than treating both, and preventive treatment of the second eye adds to the total. ## Prevention You cannot prevent primary glaucoma in a breed that carries the gene, but you can catch it earlier. If you have a Siamese or Burmese cat, ask your veterinarian about routine pressure checks during wellness visits [2][1]. For secondary glaucoma, prevention means controlling the underlying disease. Uveitis is the most common cause, so prompt treatment of eye inflammation matters [2]. If your cat has a lens problem, follow the recheck schedule closely, since progression to luxation can happen within days to weeks [4]. Know the early signs so you can act fast. Redness, a dilated pupil, cloudiness, or a firm-feeling eye all warrant a call to your veterinarian. Our guide to [cat eye conjunctivitis treatment](/knowledge/veterinary-medicine/clinical-methods/cat-eye-conjunctivitis-treatment) explains how to tell common eye redness apart from more serious problems. ## Limitations and When to Contact a Veterinarian No article can tell you whether your cat's eye is salvageable or how much vision remains. That requires an exam and pressure measurement. Individual cases need a veterinarian. Contact an emergency clinic right away if your cat's eye is suddenly swollen, the pupil is widely dilated and fixed, your cat is crying out or pawing at the face, or the eye looks different from an hour ago. These can signal a rapid pressure spike that threatens vision within hours. Call for a same-day appointment if you notice a red eye, cloudiness, a pupil that reacts slowly, or any new squinting or head shyness. Do not wait to see if it improves on its own. Schedule a routine visit if your cat is a predisposed breed, has a history of uveitis or lens problems, or is due for a pressure check as part of monitoring. ## Frequently Asked Questions ### Can glaucoma in cats be cured? No, glaucoma cannot be cured once it starts. The damage to the optic nerve is permanent, and treatment focuses on lowering pressure, controlling pain, and preserving whatever vision is left [1]. Many cats live comfortably for years with ongoing management. ### Will my cat go blind? Many cats with glaucoma lose at least some vision, and some lose it completely in the affected eye. In one surgical study, vision was present in 71 percent of cases one year after treatment [3]. The outcome depends on how early the disease is caught and how well pressure responds. ### Is glaucoma painful for cats? Yes, elevated pressure inside the eye causes pain. Cats often hide it, showing only subtle behavior changes and occasional soreness around the eye instead of obvious winking [2]. If your cat seems withdrawn or is eating less, pain could be the reason. ### Can the other eye be protected? If your cat has primary glaucoma, the second eye will eventually be affected [1]. Your veterinarian may start preventive drops in the healthy eye and will check its pressure at every visit. Early treatment of the second eye often preserves vision longer. ### Should I remove a blind eye? Removal is recommended when a blind eye is painful and no longer responds to treatment. It permanently ends the pain, and most cats recover quickly and behave more like themselves afterward. Discuss the timing with your veterinarian, since comfort matters more than appearance. ## Related Articles - [Feline Ocular Diseases: Common Conditions and Treatment](/knowledge/veterinary-medicine/clinical-methods/feline-ocular-diseases-common-conditions-treatment) - [Cat Eye Conjunctivitis Treatment](/knowledge/veterinary-medicine/clinical-methods/cat-eye-conjunctivitis-treatment) - [Cat Eyes: Understanding Feline Vision, Common Eye Problems & Care Tips](/knowledge/veterinary-medicine/symptom-guides/cat-eyes-anatomy-health) - [Treatment For Kidney Failure In Older Cats](/knowledge/veterinary-medicine/veterinary-technology/treatment-for-kidney-failure-in-older-cats) - [Symptoms Of Kidney Failure In Elderly Cats](/knowledge/veterinary-medicine/symptom-guides/symptoms-of-kidney-failure-in-elderly-cats) - [Cat Viral Conjunctivitis Treatment](/knowledge/veterinary-medicine/clinical-methods/cat-viral-conjunctivitis-treatment) - [Glaucoma in Cats and Dogs: Causes and Treatment](/knowledge/veterinary-medicine/symptom-guides/glaucoma-in-cats-and-dogs) - [Cataracts in Cats: Age of Onset and Early Signs](/knowledge/veterinary-medicine/senior-and-chronic-care/cataracts-in-cats-age-onset) - [Progressive Retinal Atrophy in Cats: Symptoms and Breeds](/knowledge/veterinary-medicine/symptom-guides/progressive-retinal-atrophy-cats) ## References 1. [Feline Glaucoma](https://www.vet.cornell.edu/departments-centers-and-institutes/cornell-feline-health-center/health-information/feline-health-topics/feline-glaucoma). Cornell University College of Veterinary Medicine. 2. [Glaucoma in Cats - Cat Owners](https://www.merckvetmanual.com/cat-owners/eye-disorders-of-cats/glaucoma-in-cats). Merck Veterinary Manual. 3. [Retrospective Evaluation of Surgical Outcomes in Cats With Glaucoma Following Diode Endoscopic Cyclophotocoagulation](https://pubmed.ncbi.nlm.nih.gov/42618953/). Veterinary ophthalmology, 2026. 4. [Clinical Features and Surgical Outcomes of Cats With Presumed Primary Lens Instability: A Retrospective Study of 34 Cases (2018-2022)](https://pubmed.ncbi.nlm.nih.gov/42338012/). Veterinary ophthalmology, 2026. 5. [Diurnal Variation of Intraocular Pressure, Central Corneal Thickness, and Ocular Surface Temperature in Van Cats](https://pubmed.ncbi.nlm.nih.gov/42411393/). Veterinary ophthalmology, 2026. 6. [Effects of 0.024% latanoprostene bunod on intraocular pressure and pupil diameter in normal cats and cats with congenital glaucoma](https://pubmed.ncbi.nlm.nih.gov/39609901/). Veterinary ophthalmology, 2026. 7. [Topical Omidenepag Isopropyl Lowers Intraocular Pressure in Normal and Glaucomatous Cats: A Pilot Study](https://pubmed.ncbi.nlm.nih.gov/41332294/). Veterinary ophthalmology, 2026. 8. [3D printed eyeball implants in dogs with advanced glaucoma: a case series study](https://pubmed.ncbi.nlm.nih.gov/41459045/). Frontiers in veterinary science, 2025. ## Further Reading - [Merck Veterinary Manual: Cat Owners](https://www.merckvetmanual.com/cat-owners) - [Cornell Feline Health Center: Health Information](https://www.vet.cornell.edu/departments-centers-and-institutes/cornell-feline-health-center/health-information) - [American Veterinary Medical Association: Pet Care](https://www.avma.org/resources-tools/pet-owners/petcare)