The Optical Product Code (OPC) is a 10-digit, numeric code that identifies the product and the manufacturer.

The Manufacturer Identification Number is a 5-digit number assigned by the OPCC.

The Item Identification Number is a four digit number assigned and controlled by the optical manufacturer.  The item identification number must be unique to each individual product.

The Check digit is a one-digit number that enables the scanner system to immediately verify the accurate data translation of the Optical Product Code as the symbol is scanned.  The 9-digit OPC, plus a scanner readable check digit (making the 10-digit total), are represented in the bar and spaces that make up the complete scanner-readable symbol.

The Optical Product Code (OPC) can be used as a typical identification system when placed on optical products, purchase orders, bills of lading and invoices.
The OPC symbol allows the use of automated data-entry devices.  As products are processed, they are passed through an optical scanner that reads of OPC symbol, decodes it and transmits this code number to the computer.  The code is captured and the information stored on the computer.  This can then be used to generate product replacement orders and produce a wide variety of control and marketing reports for management.