The colorless optical glass divides into two series: The ordinary optical glass series(P series) and bears the radiation optical glass series (N series). According to the difference of refractive index nd, middle chromatic dispersion nf-nc and dispersion coefficient yd, Uses serial number 1, 2, 3... ... behind the code number,performs to distinguish and so on,Like trademark K1, K2, K3 and so on. Widely applies in the digital photoelectricity product, the photoelectricity instrument, IT, the medical cosmetology instrument, the photography photography, the laser, the public security, the security, the aerospace and the national defense domain.