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It has been noted that affected cats tend to be dominating rather than submissive; some research argues that feline hyperesthesia syndrome is a form of conflict displacement, rather than just a form of general behavioural displacement, wherein the affected cat acts out thwarted territorial disputes on its own body. [9]
Other symptoms include dilated pupils and decreased pupillary light reflex. Fundoscopy to examine the retina will show shrinking of the blood vessels, decreased pigmentation of the nontapetal fundus , increased reflection from the tapetum due to thinning of the retina, and later in the disease a darkened, atrophied optic disc .
Affected cats may also display poor judgement of distance, and some cats may develop a rapid, crouching, hypermetric gait. Some affected cats may exhibit an abnormal head tilt, tremors, a vacant stare, excessive salivation, decreased grooming behaviors, polyphagia , and dilated pupils. [ 3 ]
Dilated pupils If your cat is telling you to stop, experts share it's best to listen if possible. "At the very worst, a cat will hiss, swat or bite at you if they're really annoyed," Dr. Diehl says.
Symptoms include sudden permanent blindness, but may occur more slowly over several days, weeks or months, [3] dilated pupils.Pupillary light reflexes are usually reduced but present; the slow phase mediated by melanopsin in retinal ganglion cells is retained.
Dysautonomia is primarily seen in cats. Symptoms include vomiting, depression, anorexia, weight loss, dilated pupils, third eyelid protrusion, sneezing, slow heart rate, and megaesophagus. The prognosis is poor and supportive treatment is necessary. Recovery in cats may take up to one year. [10]
Feline eyes also have more "rods" than human eyes. Rods impact the eyes' light sensitivity and are responsible for peripheral vision, according to the American Academy of Ophthalmology.
Symptoms may include headache, vomiting, trouble with balance, and confusion. [1] Onset is generally sudden. [1] Complications can include seizures, posterior reversible encephalopathy syndrome, and bleeding in the back of the eye. [1] [3] In hypertensive encephalopathy, generally the blood pressure is greater than 200/130 mmHg. [1]