Contact lenses can be manufactured in a variety of ways. The following video shows the various steps from lathe, to polish, to sterilization in making a contact lens.
Although this video is quite old it still gives you a good idea about the different steps involved in making contact lenses. Today contact lenses are made with out any handling, shaping or sterilizing by any human they are manufactured fully automated. The process has become so cost effective that contact lens manufacturers like Johnson & Johnson and Ciba Vision are able to produce affordable disposable contact lenses. Three popular disposable contact lenses 1-DAY ACUVUE MOIST, 1-DAY ACUVUE, and Focus Dailies (90 Pack).