Hia sorry to hear about your cat, I have been through the same my cat misty blue lost her sight suddenly, it was very scarey, she was the same stayed in doors so could still eat and drink and find her way around, the vet told us that due to blood pressure the retiners had detatched and said that we could take her to see an opthalmologist to see if there was anything that they could do, she was also put on blood pressure medication, unfortunately aftersome tests they couldnt help her with the eye sight, sorry hun x