Just bought a new lawn mower (Bosch Rotak 40), and wondered if it was necessary to wear goggles, or if new laws about safety requirements for manufacturing mowers made this safety tip redundant these days.

If the 'shell' of the mower is covering the blade, I don't possibly see how a stone/wood chip can shoot out at the angle required to hit your eyes, without hitting the case first. Can someone enlighten me on this?