My husband made an interesting observation last night

He'd gone out to the workshop after dark and returned with the comment that he thought that Vicky, the long-haired tabby, functions as something of a seeing-eye cat for Winnie, the one-eyed tortie. He said that Vicky will walk a bit and wait for Winnie to catch up to her, then the two walk shoulder to shoulder for awhile before Vicky walks a few steps ahead and then stops to wait for Winnie again. This does not happen during daylight or twilight hours when they are quite independent of each other. It's possible that Winnie does not see well in the dark. Mostly they are like sisters who squabble a lot.