According to the dispersion, it is divided into two categories: the sputum (K) with the smaller dispersion and the flint (F) with the larger dispersion.

1 光学 class optical glass is divided into fluoranthene (FK), light bismuth (QK), phosphorus bismuth (PK), heavy phosphorus bismuth (ZPK), 冕 (K), heavy 冕 (ZK), 钡冕 (BaK), 镧LaK, TiK and TK.

2 Flint optical glass is divided into light flint (QF), flint (F), heavy flint (ZF), hoverite (BaF), heavy flint (ZBaF), hoverite (LaF), heavy flint (ZLaF), Titanium flint (TiF), flintstone (KF) and special flint (TF). They are distributed in different fields in the relationship between the refractive index nd and the dispersion coefficient v (see figure).

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