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Swelling of the Optic Disk in the Retina of Cats

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Papilledema in Cats


Papilledema is a condition associated with the swelling of the optic disk located within the retina and leading to the cat's brain. This swelling can lead to increased pressure on the brain and may cause other symptoms, such as inflammation of the optic nerves.


When inflammation occurs it interferes with the eye's ability to transmit retinal information to the brain. Inflammation of the optic nerves may be related to inflammation on the brain or the retina, or could be solely related to the nerves. In some instances the optic nerve will only be partially inflamed, while in other instances the optic nerve will be inflamed along the full length of the retina.


Papilledema can affect both dogs and cats. If you would like to learn more about how this disease affects cats, please visit this page in the PetMD pet health library.


Symptoms and Types


Depending on whether the nerves in both eyes have been affected, it may be difficult to observe symptoms. If both nerves are inflamed then signs of blindness will normally be present.


Symptoms will include bumping into things; getting lost within the normal habitat; a fearful attitude; and being incapable of catching toys or finding objects. Aggressive behavior may also be present. If the disease has affected the cat's brain, neurological indicators will be present. However, if the disease is systemic in nature, the cat may display signs of weakness, anorexia and lethargy.




There are a number of underlying causes associated with this disorder, including toxoplasmosis, which is caused by parasites. Other causes include fungal infection, water on the brain (hydrocephalus), tumors, peritonitis, inflammation of the brain, inflammation of the spinal cord and their membranes, or trauma due to injury.




This condition can sometime be difficult to diagnose. Your veterinarian will perform a thorough examination of both eyes, including a check of the reflexes in the pupils and neurological nerves. Tests may also be ordered to look for fungal infections, or viral infections that are specific in nature, as well as scans to look at how well the brain is functioning.




Further testing will involve measuring the level of pressure on the cat's brain. If a systemic illness is present, the examination will include an overall physical checkup, to eliminate the presence of disease in other areas of your pet’s body. Chest X-rays may be ordered, as well as abdominal X-rays.



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