My rabbit never had cataracts, but I have one - it is too small to effect anything right now. In any case, I would weigh carefully any decision about treatment. In my experience, animals adjust far easier to blindness than people, anyway, and I bet rabbits rely so much more on smell and other senses than sight. If the treatment is simple, and not painful, that would be one thing. He is a relatively young rabbit (Miss Hoppy lived to be 11) - if the cataracts are treated now, would they likely reoccur?