The invention relates to optical glasses intended for the application fields of imaging, sensors, microscopy, medical technology, digital projection, photolithography, laser technology, wafer/chip technology, and for telecommunication, optical communication engineering and optics/lighting in the automotive sector, having a refractive index of 1.60<=Nd<=1.80 and/or an Abbe number of 30<=nud<=40 with a pronounced short flint character, good chemical stability, excellent crystallization stability, good solarization stability and the following composition (in wt. % based on oxide): 19-45% of SiO2, 3-7.5% of B2O3, 25-31% of Nb2O5, 2-8% of K2O, 0.1-2% of TiO2, 6-10% of ZrO2, 0.5-8% of Ta2O5.