The purpose of a face shield is to offer protection to the face, 
particularly the eyes, nose, and mouth, from various hazards such
as flying debris, splashes of chemicals, or infectious droplets. They
are typically made of transparent, shatter-resistant materials such as
polycarbonate or acrylic, and may be attached to a headband or helmet
for stability. Face shields are commonly used in medical settings,
but also in construction, manufacturing, and other industries
where there is a risk of facial injury or exposure to harmful substances.
