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Third, the Camber designs use VCA labels to identify whether the lens is photochromatic, or polarized, and what color the lens is. If using an older implementation of IOT, it is possible these labels might not be in the list of labels sent to the calculator from Rx-Universe. This can be easily changed by modifying the LDI file for IOT to include PHOTO and POLAR. Please see the section on Modifying Use of LDI (initialization files for details on doing ) with Digital Vendors for more information on this.