Hm. I’m not sure. I don’t think he’s blind because he has played before with a mouse toy. He does come in from outside and meow a lot, I feed him but he keeps meowing. He could be in pain….Cats don't always let people know they are in pain. Hiding a weakness is a feline instinct. That is why sick cats spend hours under beds.
Blind cats are afraid of being alone and make that clear when they figure out nobody is with them.