In order to provide good vision to people who have a condition called presbyopia,the bifocal contact lenses are carried out.The main sympotom of presbyopia is that you need to hold menus, newspapers and other reading material farther from your eyes in order to see it clearly.Bifocal contact lenses come in both soft materials and rigid gas permeable (GP) materials. Some can be worn on a disposable basis. It means that you are titled to throw the lenses out at specified intervals (even daily, in some cases) and replace them with fresh, new lenses.Thanks!