I think they'll have to come up with a less scary name for it though.
the flap size itself keeps the lens in place; the elasticity of the underlying tissue itself, until it heals into an encapsulation.
the surgery videos of that procedure make me squeamish unlike other surgery videos. Watching an eyeball get deflated/inflated with liquid pressure from the surgeon is just un-nerving to me; not as bad as watching a glaucoma surgery -- but up there.