I'm sorry to say I don't have any ideas about what could have happened so suddenly. I just wanted to send best wishes for Lucille. Clearly she is treasured and her transition from sight will be made easier having a loving Mom and Dad looking out for her. I did once read that putting scents (like cooking extracts - vanilla, lemon, etc) can be dabbed on furniture legs to help blind ferrets find their way without bumping into things. Using different scents for different rooms helps them to orient themselves too. Many dooks and good luck Risa [Posted in FML issue 4901]