Which eye protection for which work?
Safety glasses are enough against flying particles from sawing, drilling and grinding. When working with liquids, dust or chemicals, goggles seal all around and also block splashes from the side. For grinding with large discs or work with molten metal, add a face shield on top: that protects your whole face but doesn't replace the glasses underneath.
Check the marking on the lens and frame: F, B or A for impact strength, plus codes for radiation. Welding uses separate shade numbers; see the welding equipment for that.
Preventing fogging and scratches
The two reasons people take their glasses off are condensation and scratches. Choose a version with anti-fog coating (marking N) and scratch-resistant lens (marking K), clean the lenses wet and never with a dry, dusty cloth, and store the glasses in a case rather than loose in the toolbox.
