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In the laboratory, the prescription eye glasses start off as lens blanks, which are either made from a plastic or glass disc that is about four inches wide and up to one and one-half inches thick. The blank lens has a flat back surface and a curved front surface.
Safety glasses are made of polycarbonate or CR39 (plastic) or Trivex. Markings on safety glasses: The manufacturer or supplier logo is marked (or etched) on all approved safety lenses, frames (front and temple), removable side shields, and other parts of the glasses, goggles, or helmets. Frames: Safety frames are stronger than street-wear frames and are often heat resistant.