What is a possible consequence of not using a properly adjusted welding helmet?

Using a properly adjusted welding helmet is crucial for protecting the welder's eyes and face from harmful ultraviolet (UV) rays and intense light produced during the welding process.

Welding produces intense brightness that can lead to "welders' flash" or photokeratitis, a painful condition similar to sunburn of the cornea. Without a properly adjusted helmet, the welder is at greater risk for direct exposure to harmful radiation and excessive brightness, which can cause temporary or even permanent eye damage. An inadequately fitted helmet may not provide full coverage, allowing light exposure around the edges or failing to darken sufficiently during welding, thereby exposing the welder's eyes to serious risks.

While the other consequences are indeed important in their respective contexts—like skin irritation from sparks, noise-induced headaches, and fatigue from unsafe working conditions—they do not address the critical failure of eye protection that can lead to immediate and serious vision impairment. Hence, ensuring the helmet is properly adjusted is fundamental to safeguarding against eye damage from UV radiation and intense light.