To be effective, an eye or face shield should:

To be effective, an eye or face shield must be free of scratches; be resistant to penetration; allow clear views to both sides; fasten securely; permit air to pass through to prevent fogging; and allow room for eyeglasses or sunglasses, if needed.

• Be easily broken.
• Restrict your view to both sides.
• Be tight to your face, not allowing eyeglasses to fit underneath.
• Fasten securely.