The answer is absolutely yes. It's really dangerous to the eyes when welding. The most serious and dangerous factor are sparks. The sparks produced while welding may fly into our eyes and melt the contact lenses with their high temperature. Thus, our eyes may be hurt by the burn and heat, what's worse, may give rise to blindness. Even though we can keep away from the hurt by sparks, the light from welding are so strong that will harm our vision severely. Moreover, the harmful gases and dust around the spot can be easily attached to the surface of retina, which can lead to amphiblestritis. Accordingly, the essential step is wearing electric welding glasses particularly for the people working in the welding which can protect eyes from harms by welding.