Prisms are transparent optical blocks having at least two flat polished sides inclined relative to each other, at precisely controlled angles, so as to deflect, deviate, and rotate beams of light as well as dispersing their wavelengths. There are many types of prisms, each having a particular shape to achieve the necessary reflections to perform a specific optical task.

Tower Optical's prism capability includes Penta Prisms, Right Angle Prisms, Dove Prisms Roof Prisms, Corner Cube Reflectors, Anamorphic Prisms, Wedge Prisms and Polarizers called Glan-Taylor Prisms, Wollaston Prisms and Rochon Prisms.