OHST Practice Exam 2025 – The Comprehensive All-in-One Guide to Exam Success!

The correct answer is ultraviolet radiation. Electric welder's arc produces intense ultraviolet (UV) light, which can cause severe damage to the eyes, a condition often referred to as "welder's flash" or photokeratitis. This occurs when the UV rays burn the cornea, leading to pain, redness, and temporary vision loss.

UV radiation is particularly harmful because it is not visible to the naked eye, which means individuals may not take precautions when they are exposed to it during welding activities. In addition to immediate injury, repeated exposure to UV rays can lead to long-term damage such as cataracts.

Infrared light, while also produced by welding, primarily affects skin and can cause burns or heat-related injuries but is not the main cause of eye damage in this context. Invisible radiation refers to a broader category that may include various forms of radiation, but it does not specifically highlight the dangerous effects on the eyes. Sensible light typically refers to visible light that can be seen and does not cause the specific kind of damage associated with the intense UV light emitted during welding.