What are the working conditions of banglemakers of Firozabad?

The bangle makers of Firozabad have extreme working conditions, wherein they have to work in the glass furnaces with extremely high temperatures, in dingy cells without air and light; where they slog their daylight hours, often losing the brightness of their eyes. Not just that, there are small children who are made to work in such pathetic conditions, leading them to lose their eyesight even before they grow up.