Pooky's eyes do that sometimes. He's blue eyed and point marked, not FELV+ though, and I do believe he's ragdoll mix not siamese. Doesn't seem to effect him any though, although he is a klutz, but he's always been a klutz. He gets to zooming around without paying attention. lol Vet has looked him over and said Pooky was healthy and not to worry about him. Dunno if Pooky's 'twitching eyes' is the same as your kitties though, ask your vet and see what he/she says.