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.
For eye protection we have Visionaire Goggles.
They are a high performance splash/impact goggle with an anti-fog, anti-scratch, anti-static and UV protective lens. With four indirect ventilation slots further improves fog resistance.
Wide contact points provide a very comfortable fit, with an extra wide adjustable strap.