Safety experts say clearer warnings would be welcome, but urged parents to teach their children about the potential dangers of microwaves. The girl had reheated the previously boiled egg - with an intact shell - using a domestic microwave oven at full power for about 40 seconds. The heated egg was removed from the oven and placed in a bowl. It exploded 30 seconds later as she was carrying the bowl to the dining room, hitting her in the face and her right eye. She suffered a perforated cornea and rupture of the lens capsule, leaving her vision so impaired she could see nothing more than hand movements.