Retinal or optic nerve damage can cause loss of vision leading to mydriasis because the sensory system that detects light is not working. It is important to know if the animal has displayed any loss of vision, especially night vision, or has experienced any trauma. This is important since the pupil size is dictated by many different factors including muscles, nerves, sensory input and eye pressure. ![]() We also use a bright source of direct light to test the function of the pupil under intense light the pupil should constrict appropriately.Īnimals with unequal pupils should have an ophthalmic exam done by a veterinarian. We do this by placing the animal in a darkened room if the eye with the smaller pupil size dilates normally then the mydriatic eye is the problem. Conversely, when the pupil cannot dilate properly and remains constricted this is referred to as miosis.Īnytime an animal presents with pupils of unequal size, we must determine if one pupil is abnormally dilated or if, in fact, one is abnormally constricted. I would like your opinion.Ī: When the pupil of the eye is unable to constrict normally, or fixed and dilated, this condition is called mydriasis. Other than the eyes, he is a well-behaved, frisky cat. ![]() This might go on for several days, but then the eye will return to normal. Sometimes the pupil of one eye will be dilated while the other one is normal. He has been with us for more than 3 years and seems healthy, but there is one problem that is baffling. We took him to the vet and were told he had Feline Leukemia.
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