HB Anti-Fog Face Shield. When working on a patient or in the lab, often times infectious, hazardous or undesirable substances will splatter. The HB Anti-Fog Shield is a lightweight, disposable face shield that provides protection of eyes and face from accidental exposure to hazardous substances. Keystone’s HB Anti-Fog Shield offers OSHA-level protection against splash of bodily fluids in the face for medical, dental and emergency medical healthcare workers.