After a few minutes to a few hours of watching welding, the local eye will have an obvious and strong foreign body sensation, stinging sensation, photophobia, tearing and eyelid spasm symptoms, which are usually treated symptomatically. The reaction after welding is due to corneal epithelial necrosis and detachment, so topical eye drops that promote corneal epithelial healing, such as recombinant human epidermal growth factor eye drops, can also be used at the same time. If the pain is more pronounced, you can take oral pain medication, such as fenpropidin. Local cold compresses can be applied to help reduce pain, and most importantly, avoid opening the eye back and forth, as well as bright light exposure, which will significantly reduce the pain. Usually after 24-48 hours, the symptoms will be reduced or cured.