How to know if there's eye damage caused by laser hair removal?

If the protective eyeware was not snug, the operator should be alerted. I only use metal eye shields for protecting patient eyes and never have them wear goggles, such as the ones I wear. These goggles can still allow the laser to hit the eye from the sides or underneath and are meant to be used only by the laser operator. Problems to the eye should be immediately noticed and would be a spot in the vision which is black if the retina was injured. If the iris was injured, the colored part of the eye would look unusual and you would have a hard time with bright lights and sunshine. The pupil might also look abnormal. Lasers such as Fraxel might cause a corneal burn which is painful but not as severe a problem. If there is any doubt, see an Ophthalmologist. A sudden burst of light from the laser on an exposed eye can cause you to see spots temporarily, and that is simply because the light receptors were overwhelmed temporarily and that should only last a minute or 2.