Causes of acute unequal pupil size7/30/2023 ![]() Treatment of anisocoria depends entirely on the underlying cause of the condition and specific treatment is tailored specifically to the diagnosis. Other causes of anisocoric pupils in cats include: Continue reading this other article if you want to know more about feline leukaemia. ![]() Clinical signs that may occur include differences in pupil diameter, as well as other symptoms such as anaemia, oral disorders or gingivitis, fever, lethargy, weight loss or infection. Continue reading this other article if you want to know more about glaucoma in cats.įeline leukaemia: Feline leukaemia retrovirus can cause a variety of symptoms and blood disorders in affected cats. Glaucoma: increased intraocular pressure, also known as glaucoma, causes the affected eye to dilate a little more, resulting in one of your cat’s pupils becoming larger than the other. Continue reading this other article if you want to know more about Horner’s syndrome.Ĭorneal lesions: damage to the surface layer of the eye can cause ulcers and thus a difference in pupil size due to changes in the affected eye. It is manifested by sunken eyes, mydriasis and miosis, as well as other symptoms such as a prolapse of the third eyelid or a difference in the size of the eyes. ![]() Horner’s syndrome: consists of a set of symptoms due to a disease or problem resulting from a lack of sympathetic supply. Although anisocoria in cats can occur as a result of a disorder in the cat’s physiological system, it is usually caused by disease. The causes of anisocoria are many, it is a symptom and in itself is reason enough for an urgent visit to the vet, especially if it occurs suddenly. The eyelid of the affected eye is drooping.The cornea (the outer surface of the eye) is cloudy or bluish in colour.The white part of the affected eye is red.Here are the other common symptoms associated with anisocoria: However, depending on the underlying cause, the eye with anisocoria may undergo other structural changes and the cat may also behave differently. The most common symptom of anisocoria in cats is a difference in the size or diameter of a cat’s pupils under the same lighting conditions. Static anisocoria: when there is a difference in pupil size despite both pupils receiving the same illumination, this type of anisocoria is completely abnormal.Dynamic anisocoria: when the stimulated pupil contracts more than the other unstimulated pupil following stimulation by a direct light source, which is normal in able-bodied cats.The affected pupil may be larger or smaller than the normal pupil.Īnisocoria in cats can occur in two ways: Anisocoria is a condition in which the pupils of the cat’s eyes are different sizes. 2003 110(8):1606-14.Īmerican Academy of Ophthalmology.As mentioned above, the pupils are the black part of the eye, located in the centre of the iris. Pupil size and quality of vision after LASIK. Schallhorn SC, Kaupp SE, Tanzer DJ, Tidwell J, Laurent J, Bourque LB. Ocular manifestations of drug and alcohol abuse. Pupillary reactivity as an early indicator of increased intracranial pressure: the introduction of the Neurological Pupil index. doi:10.3892/ol.2017.5648Ĭhen JW, Gombart ZJ, Rogers S, Gardiner SK, Cecil S, Bullock RM. Iris metastasis as the first sign of small cell lung cancer: a case report. March 23, 2016.īrigham And Women's Hospital. Pupillary disorders including anisocoria.Īmerican Academy of Ophthalmology. What kinds of eye examinations are there? April 20, 2016. Anisocoria and an array of neurologic symptoms in an adult with Ewing sarcoma. Safe and sensible preprocessing and baseline correction of pupil-size data. Mathôt S, Fabius J, Van Heusden E, Van der Stigchel S. ![]() A model of the entrance pupil of the human eye. ![]()
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