The document summarizes the boxing system used for measuring eyeglass frames. The boxing system imagines drawing a box around the lens shape with the sides tangent to the edges. Key measurements include the A measurement (eye size), B measurement (vertical size), geometric center, distance between lenses, distance between centers, effective diameter, seg height/drop, temple length, length to bend, and front to bend. These standardized measurements are used to specify frame sizes and fit lenses.