When should someone wear safety goggles instead of safety glasses?

In most cases, safety goggles are stronger than safety glasses so they will provide higher impact protection as well as more protection from chemical splashes, sparks, and dust. If you grind any type of metal and sparks are involved, safety goggles must be worn. Having a seal over the eyes will protect against airborne metal and particles. Indirect vented safety goggles are a good choice for these specific tasks.