Automatic optical sorting system for use during final stages of manufacture of spectacle lenses shines light through lenses to measure transmission, which is compared with design value

摘要

The automatic optical sorting system is used during the final stages of manufacture of spectacle lenses to reject faulty lenses. A light may be shone through each lens in turn to measure the coefficient of transmission. Different wavelengths of light may be used to obtain a spectral curve. A computer may compare the measured values with a design value.