What is the consequence of not using a proper welding helmet?

Using a proper welding helmet is essential for protecting oneself during welding activities. The primary function of a welding helmet is to shield the welder's eyes and face from the intense light and harmful radiation produced during welding processes. Without a suitable helmet, one can suffer from eye injuries, particularly from the ultraviolet (UV) and infrared (IR) rays emitted during welding. These rays can cause conditions such as "arc eye," which is a painful inflammation of the cornea, and prolonged exposure can lead to more severe long-term vision problems.

The other options highlight important safety concerns but do not directly relate to the sole purpose of a welding helmet. For example, head injuries from falling objects relate more to overall site safety rather than welding-specific protection, while burns from sparks and neck strain are consequences of improper ergonomic or protective gear but not specifically tied to the function of the welding helmet itself. Thus, the most critical consequence of neglecting to use a proper welding helmet is the risk of sustaining eye injuries from harmful rays during welding operations.