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Progressive Retinal Degeneration in Cats

By: Dr. Noelle McNabb

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Veterinary care often includes diagnostic tests to confirm the presence of PRD and to exclude other diseases. Tests may include:

  • A complete medical and ophthalmic history. Information of particular importance includes any known information regarding retinal diseases in related animals; the duration and pattern of onset (sudden or slowly progressive) of vision loss; any physical abnormalities accompanying the vision loss; and any medications currently being given to the pet. A thorough physical examination is performed to determine whether abnormalities are confined only to the eye or involve other organs in the body.

  • A complete ophthalmic examination is indicated and involves all of the following tests. Your veterinarian may refer your cat to a veterinary ophthalmologist for completion of some of these tests:

    – Tests to evaluate vision, such as observing the cat as he navigates an obstacle course in both bright and dim light, and certain neurologic reflex testing
    – Pupillary light reflex testing
    – A Schirmer tear test and fluorescein staining of the cornea
    – Tonometry to measure the pressure within the eye
    – Specialized examination of the front chamber of the eye, the iris and lens, the vitreous and the retina.

  • If your veterinarian is concerned that some disease other than PRA is the source of the cat's blindness, then medical tests to rule out other causes may include the following:

    – A complete blood count (CBC) and serum blood tests
    – A feline leukemia virus (FeLV) test, a feline immunodeficiency virus (FIV) test, a toxoplasmosis titer and fungal titers to look for the presence of these infectious diseases
    – Plasma or blood taurine levels
    – A measurement of systemic arterial blood pressure to rule out high blood pressure
    – Possibly chest and abdominal X-rays
    – Ultrasonography of the structures behind the eye
    – CT scan or MRI of the brain and vision pathways leading to the brain
    – Cerebral spinal fluid tap to evaluate the fluid around the brain

  • An electroretinogram may be indicated if the retina appears to be the source of the blindness based upon the physical and eye examination findings. This test is essential for confirming the diagnosis of PRD.

    Treatment In-depth

    There is no treatment for PRA/PRD. It is very important not to breed affected animals.

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