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One area of Opticianry that seems to have more Opticians baffled is prism. I hope in this short tutorial it will ease the misunderstanding of prism. This tutorial is not meant to understand every aspect of prism, it is meant to help you understand prism in your everyday setting as an Optician. In order to help us we need to think of lens as two prisms. A lens with prisms base to base is a plus lens and a lens with prisms apex to apex is a minus lens.