High index glasses

A high refractive index glass comprising:

• a refractive index greater than or equal to 1.7;
• between about 38 wt. % and about 45 wt. % SiO2;
• between about 15 wt. % and about 20 wt. % TiO2;
• between about 6.0 wt. % and about 10 wt. % ZrO2;
• between about 0.5 wt. % and about 4.0 wt. % La2O3;
• between about 0.5 wt. % and about 4.0 wt. % Nb2O5;
• between about 12 wt. % and about 19 wt. % BaO;
• between about 0 wt. % and about 4.0 wt. % SrO;
• between about 3.0 wt. % and about 8.0 wt. % CaO;
• between about 0 wt. % and about 3.0 wt. % Li2O;
• between about 2.0 wt. % and about 6.0 wt. % Na2O;
• between about 4.0 wt. % and about 8.0 wt. % K2O;
• between about 0 wt. % and about 3.0 wt. % Al2O3;
• between about 0 wt. % and about 3.0 wt. % B2O3;
• between about 0 wt. % and about 3.0 wt. % MgO;
• between about 0 wt. % and about 3.0 wt. % ZnO;
• between about 0 wt. % and about 2.0 wt. % of the combination of Sb2O3+F+Cl+Br;
• and
• wherein the high refractive index glass is essentially free of As2O3,
• wherein the combination of BaO+SrO+CaO is between about 17 wt. % and about 25 wt. %,
• wherein the combination of Li2O+Na2O+K2O is between about 6.0 wt. % and about 10.5 wt. %, and
• wherein the combination of Al2O3+B2O3+MgO+ZnO is between about 0 wt. % and about 12 wt. %.