The properties that are important for the application of optical glasses are specified. It is described which regions of optical properties are realized today. In the last 15 years the improvement of existing glass types has been priority over the development of new glass types. Logistic actions on the availability have been useful for producers and users and will be continued. Scientific investigations of new glass systems give indications to new regions of refractive indices and dispersion behaviour which may be received. But glasses with extreme optical properties may have disadvantages (e.g., lower chemical resistance, lower transmission) or other limitations. A patient and consequent development - also concerning glass-type-specific production methods - may yield interesting new glass types.