The worker is required to have close visual acuity with or without corrective lenses for extensive reading; visual inspection involving small defects, small parts, and/or operation of machines (including inspection); using measurement devices; and/or assembly or fabrication parts at distances close to the eyes. The work environment may include a variety of physical conditions such as proximity to moving mechanical parts, electrical current, working on scaffolding and high places, exposure to chemicals, ultraviolet light and lasers, working in enclosed spaces, close quarters, narrow aisles or passageways.