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How old is your cat
OK. Based on your description, it sounds like he has suddenly become blind. My main concern is that it may indicate hypertension with retinal detachment. I highly recommend having him seen by a vet as soon as possible to have his blood pressure checked. If we confirm that it is high, he should be starting on a medication called amlodipine immediately.
The weight loss with associated ravenous appetite and inappropriate urination is suggestive of either hyperthyroidism or diabetes mellitus. We can easily test for these with some screening blood work. Then, once we have a diagnosis we can begin treatment.
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