Flash burns are like sunburn in the eye and can affect both your eyes. Your cornea can repair itself in one to two days, and usually heals without leaving a scar. However, if the flash burn is not treated, an infection may start.Click to see full answer. Just so, what does welders flash feel like?Flash burn symptoms develop five to 10 hours after exposure, and include burning watery eyes, red eyes, blurred vision, sensitivity to light and feeling like you have something in your eye. They can be easily prevented by using eye protection such as a welder’s mask. Flash burn can be incredibly painful.Also, can arc eye cause permanent damage? Damage from ultraviolet light can occur very quickly. Normally absorbed in the cornea and lens of the eye, ultraviolet radiation (UVR) often causes arc eye or arc flash, a very painful but seldom permanent injury that is characterized by eye swelling, tearing, and pain. Correspondingly, can you go blind from welding flash? When welders don’t properly protect their eyes from the arc, they commonly suffer welder’s flash, or photokeratitis, a condition caused by exposure to intense ultraviolet radiation resulting in temporary blindness and extreme discomfort. More extreme eye injuries can result in permanent blindness.How long does it take for welders flash to set in?Any time from 3-12 hours after overexposure to ultraviolet light, you may begin to notice symptoms: Pain that can be mild to very severe.