The optical glasses designated to be used in the areas of imaging, sensors, microscopy, medical technology, digital projection, photolithography, laser technology, wafer/chip technology as well as telecommunications, optical communications engineering and optics/illumination in the automotive sector with a refractive index nd of 1.60≦nd≦1.72 and/or an Abbe number vd of 32≦vd≦45 and with a Tg of 567° C. to 640° C., pronounced short flint character, good chemical resistance, excellent resistance to crystallization, good solarization stability and the following composition (in % by weight based on oxides): SiO230-45 B2O3 8-12 Na2O 8-15 CaO0.1-7   ZnO0 ≦ 5 ZrO210-20 Nb2O512-24 Ta2O50 ≦ 9 AgO 0 ≦ 5.