Optical glass

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A high refraction low dispersion optical glass having a refractive index of 1.86-1.92 and an Abbe number of 36-42. The components of the optical glass comprise, by weight percentage : B2O3 : 1-30%; SiO2 : 0-20%; La2O3 : 25-55%; Gd2O3 : 5-40%; Y2O3 : 0-25%; Yb2O3 : 0-10%; Ta2O5 : 0-10%; Nb2O5 : 1-30%; TiO2 : 0-10%; ZrO2 : 0.5-20%; WO3 : 0-10%; ZnO : 0-15%; Al2O3 : 0-10%; GeO2 : 0-10%; Bi2O3 : 0-10%. The optical glass does not contain PbO or F. A high refraction low dispersion optical glass having excellent light transmittance may be obtained by introducing suitable amounts of rare earth oxides having a high refraction low dispersion effect and optimizing the proportions of said components.