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Your vision goes back to normal after your blood sugar stabilizes. The pupil lets light into the back of the eye, where receptors read the light and form nerve pulses. Sugar is naturally processed in the body by the hormone insulin, which is produced in the pancreas. Milk fever: This condition occurs in female cats who are nursing kittens. Thiamine deficiency is rare in cats and is usually associated with those who eat a home-made diet that is either cooked in water or heat (both of which destroy thiamine) or a diet high in fish. Sometimes, its the result of other eye conditions, but it can also happen on its own. Infections often wax and wane over time, appearing to improve or go away, only to come back again later. This disease, which is most often associated with FIV, FeLV, FIP and other infectious organisms, is usually chronic and is likely to result in gradual blindness. Older cats are prone to high blood pressure, and the pain and discomfort associated with the condition can lead to dilated eyes. Supportive care may include intravenous fluids to correct pH disturbances or electrolyte imbalances, oxygen therapy, pilocarpine to reduce pupil dilation, diazepam to control seizures. You might notice the pupil being dilated temporarily while in low light, or adjusting to bright light, and this usually lasts only while theyre in low light, or for just a second or two as they transition into bright light. If the tumor is small, it may be treatable by laser. We call this wide-open pupil mydriasis. 1998-2023 Mayo Foundation for Medical Education and Research (MFMER). Mayo Clinic does not endorse companies or products. If the lighting isn't dim, the cat is widening its pupils for a different reason. An advanced non-invasive medical imaging technique that uses a combination of x-ray imaging and a digital computer to produce detailed 3-dimensional images to evaluate for brain tumours. Where possible, administer antivenom which counteracts the effects of the venom. Do Cats Understand Human Smiles And Facial Expressions?