I hope Corkscrew and Tibby are better very soon. It is sad about Tibby`s eyesight but as you say it explains a lot about how she is, and now you know the whys and wherefores you can help her a lot more.
Please give them both some hugs and kisses from me....well, Tibby anyway, I hope Corkscrew won`t let you, cos then you`ll know for sure he is a lot better!

Christine