| 摘要 |
This invention is directed to the production of glasses especially suitable for use as ophthalmic lenses which exhibit indices of refraction between about 1.699-1.703, Abbe numbers equal to or greater than 41.0, densities less than 3.25 g/cm<3>, and good resistance to attack by acids. The glasses are essentially free of Al2O3 and consist essentially, in weight percent on the oxide basis, of: <TABLE> t |
