When discussing arc flash face shields what causes astigmatism?
The optical quality of an arc flash face shield has many variables that need to be considered. A few of the most important terms and definitions are listed below. Prismatic Power and Imbalance Prismatic power is defined as any the deviation of a ray of light through a specified point on a lens. Prism in a face shield can be produced when the front surface is not parallel to the back surface. When light passes through the prism, the object viewed appears...