The model identification mark is on the inside of the temple. The information relating to the lenses can be found on the barcode label attached to the product packaging and/or on the inside of the temple, after the asterisk. The number indicates the filter category as defined by the standard EN ISO 12312-1. If two numbers are shown, this means that the lens is photochromic and the two numbers represent, respectively, the filter category in its clear state and in its darkened state. Letter P indicates that the lens is polarized. Letter A or U indicate that your spectacles are not suitable for driving and for use on the road only according to the US (A) or Australian (U) standard. If the frame has a pendant label with a car crossed out, it means that your spectacles are not suitable for driving and for use on the road according to the standard EN ISO 12312-1.