#2 BlindnessĪ cat with dilated pupils may actually be blind. High blood pressure is usually treated with oral medication and it is important to address any underlying medical conditions. We most commonly see high blood pressure in geriatric cats, particularly those with an underlying condition such as hyperthyroidism or kidney failure.Ī cat’s blood pressure should be between 120-150 mm HG, but those with hypertension often have regains over 180mm HG. High blood pressure in cats can be hard to diagnose as signs are not always obvious. Why are my cat’s eyes always dilated? This is a question many cat owners ask me with concern in their voices.Ĭertainly, noticing something unusual is always cause for anxiety and needs to be looked into.Ī cat with dilated pupils could have a range of medical conditions and common explanations include: #1 High Blood Pressure For example, if atropine drops have been applied, the pupil will dilate temporarily. Medication side effects are another consideration. While your senior cat is in no danger from its iris atrophy, it is important to confirm the diagnosis with a vet. The weaker muscle is less capable of constricting pupils. This naturally thins out in our senior kitties. The colored part of the eye is also called the iris. Iris atrophy that occurs in elderly cats can lead to larger pupils. You should see your vet check for this response by shining a small flashlight into the eyes. However, as soon as the level of light increases, the pupils constrict right down. In dim light, it is normal for pupils to dilate in an attempt to allow the maximum amount of light in. Once your kitty calms down and is feeling back to normal, its pupils will constrict. In a healthy cat, we will see temporary pupil dilation due to: High stress levelsįor example, a cat who is in extreme pain or who is very anxious about being in a vet clinic will have large, black eyes. Dilation of the pupils of the eye should occur in certain circumstances but should never be a permanent change. Scientifically speaking, when the pupils do not constrict back to regular size, this is called ‘mydriasis’. We earn a commission if you make a purchase What Causes a Cat’s Eyes to Dilate? If a cat’s eyes are always dilated, there is likely something amiss, so read on to learn more about the causes. This controls the amount of light entering their eyes and is important for vision in bright and dim lighting. A cat is able to constrict and dilate its pupils, just like you and I.
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