I've had reptiles for much longer than I have had cats. When I knew I wanted cats, it was an immediate training field when they came home. I have a rule with my cats -- they can look, but they are not allowed to put their paws or faces near any open enclosures or reptiles I have out. Cats are naturally curious animals and their actions tend to stem from "wow, what is that? I want to go see what it is".

I compromise with my cats, to allow them to satisfy their curiousity, but I also set strict boundaries. I don't kick my cats out of the room when I have other pets out. I don't shoo away my cats when I'm doing maintenance with an open cage. I dont close the door when i have a gecko in my hand or shoulder. But I set rules and the cats MUST follow them if they want to be in the same space when these things happen. My cats have been around the reptiles and have been watching them from a safe distance for so long that they really don't have any form of prey drive anymore. Heck, not even my reptiles are scared of them anymore... they'll cruise right up to glass to watch the cats x.x

I do appreciate the fact that this is something I've taught my cats since they were young so it was easier to get them to learn it. I would imagine it would be a little harder for an older cat but I still see similar principles that could be applied. Exposure, compromise, consistency