After an eruption one of the possible hazards is widespread ashfall. The Civil Defence Emergency Management Office says; If you have to go outside use protective gear such as masks and goggles and keep as much of your skin covered as possible. Wear eyeglasses, not contact lenses as these can cause corneal abrasions.
These are a basic, clear, polycarbonate goggle with an anti-fog coating. They have indirect ventilation to further promote anti-fogging.
These goggles are suitable for dust and chemical splash, they feature a 1mm lens thickness.