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Hello. My name is***** and I am a veterinarian that can answer your question. I understand Dallas has apparently lost his eye sight suddenly and is pacing and putting himself into tight areas. I am very sorry to hear about what is happening. Does Dallas have any recent history of kidney disease or other medical problems? Is there any possibility of toxicity to medications or marijuana? These can cause neurological impairments, so that is why I ask.
Thank you for that information. I am sure this is disconcerting for you to observe. One of the causes of sudden blindness in cats is from retinal detachment. This is often a result of hypertension. If treated early, it probably has the best outcome as the retina can sometimes re-attach itself and vision can be restored. Cataracts will cause vision loss, but they are not necessarily dangerous. Diabetes is a common cause of cataracts, so this should be ruled out. Usually there is a history of excessive thirst and drinking water. A brain mass is probably the least favorable reason for sudden vision loss.
What you need to do next is to have Dallas' retina and eye evaluated, put on medication for elevated blood pressure if necessary, and evaluated for any mass that might be contributing to vision loss. A regular general practitioner veterinarian should be able to assess the majority of these causes.
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