What should I do if I notice my cat is losing their sight?

Cats don't always read books; they are good at adjusting to things and hiding things. For you to realize that your cat is blind or losing its vision is impressive because cats don't show you that, so it's not going to be that easy. If a cat slowly loses its vision, or if it is good at adjusting to things, you're not going to realize what's going on. Otherwise, if a cat suddenly loses its vision, it might bump into things, act a little weird, or its pupils might seem large. You should bring them in because a common cause of a cat losing its vision is high blood pressure and a blown-out retina. That could be related to hypertension from hyperthyroidism or kidney disease. We're going to look for diseases other than an eye problem.