The invention is related to a method for making a silicone hydrogel contact lens having a nano-textured surface which mimics the surface texture of cornea of human eye. When the faulting address trap is raised, the faulting thread will enter a trap handler, which suspends the faulting thread. As a result, lamp makers and lamp power can be selected relatively freely, making it possible to select discharge lamps by purpose. The implantation is done from the first surface in a direction substantially perpendicular to that surface. Novel high yield, stereoselective processes for the preparation of the chiral substituted alkanol compounds from chiral and achiral intermediates are described. The multilumen respiratory circuit can provide a variable rebreathing volume.