A proper fitting safety glass ensures comfort, increased productivity and enhances safety to reduce the risk of costly eye injuries. A simple measurement is all that is needed to help determine the proper fit. Another consideration when choosing the right pair of Bullhead Safety Eyewear is the lens base curve. A lens base curve is the measure of the general shape of the lens. The higher the base curve, the more curvature there is in a lens, the more curvature the lens has the more it wraps around the face, creating more coverage and increasing side protection.