Plastic optical lenses are used inmany everyday things, from your car to reading glasses, but few people knowexactly how they are made. When you purchase plastic optical lenses, chancesare they were produced by one of the following three ways; injection molding,thermoforming, or calendering. This article will take you through each of thesemethods and show you what goes into the process so that you can decide whichmethod would be right for your project needs.