Cat eye with single constricted pupil?

What could it indicate if a cat's right pupil appeared permanently constricted while the right appeared normal?The cat in question has been a severely underfed stray for many months now, likely with problems associated with starvation and parasites.

  • Vetinfo

    By: Erika Raines El Segundo, CA

    Replied on 04/19/2011

    Cats with one pupil constricted may have several different problems. One of the more common problems is called Horner's syndrome. In this syndrome the pupils will be uneven and there will be other changes to the eyes such as a protruding third eyelid. Other causes of this inequity between pupils can be more serious, such as a brain tumor. This cat should be seen by a veterinarian. If the cat is in a condition like you describe, the unequal pupils may not be his or her biggest problem. If you or someone you know does not intend to adopt this cat, you should call animal control or the local humane society to humanely capture and take care of this cat.

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