I'm not sure that's stopping saccades. However, I think I know what you mean as I've done it a few times, if you want a deeply unsettling experience do it close

I'm not sure that's stopping saccades. However, I think I know what you mean as I've done it a few times, if you want a deeply unsettling experience do it close up in a mirror. Parts of your face disappear and are replaced with various patches of skin or whatever is around as you fill in the gaps.