A glass comprising a plurality of components, the glass having a composition of the components comprising: • greater than or equal to 3.0 mol.% and less than or equal to 35.0 mol.% WO 3, • greater than or equal to 0.3 mol.% and less than or equal to 50.0 mol.% TiO 2, • greater than or equal to 0.3 mol.% and less than or equal to 50.0 mol.% Nb 2 O 5, • greater than or equal to 0.0 mol.% and less than or equal to 20.0 mol.% Bi 2 O 3, • greater than or equal to 0.0 mol.% and less than or equal to 10.0 mol.% TeO 2, • greater than or equal to 0.0 mol.% and less than or equal to 5.0 mol.% PbO, • greater than or equal to 0.0 mol.% and less than or equal to 3.0 mol.% MoOs, • greater than or equal to 0.0 mol.% and less than or equal to 1.0 mol.% V 2 O 5, • greater than or equal to 0.0 at.% and less than or equal to 5.0 at.% F, • greater than or equal to 0.0 at.% and less than or equal to 1.0 at.% Cl, • greater than or equal to 0.0 at.% and less than or equal to 1.0 at.% Br, • greater than or equal to 0.0 at.% and less than or equal to 1.0 at.% I, • greater than or equal to 0.6 mol.% and less than or equal to 60.0 mol.% TiO 2 + Nb 2 O 5 and • optionally comprising one or more components selected from Al 2 O 3, B 2 O 3, BaO, CaO, Gd 2 O 3, GeO 2, K 2 O, La 2 O 3, Li 2 O, MgO, Na 2 O, P 2 O 5, SiO 2, SrO, Ta 2 O 5, Y 2 O 3, Yb 2 O 3, ZnO and ZrO 2, wherein the glass has • a liquidus temperature, T liq, that is greater than or equal to 850 °C and less than or equal to 1350 °C, and wherein the glass satisfies the conditions: • 1.92 ≤ P n ≤ 2.08 and • P n − 1.437 + 0.0005 * T liq > 0.00, where • P n is a refractive index parameter, calculated from the glass composition in terms of mol.% of the components according to the Formula: P n = -0.0051086 * Al 2 O 3 - 0.0049247 * B 2 O 3 / 0.00034289 * BaO + 0.0086552 * Bi 2 O 3 - 0.0014511 * CaO + 0.0047429 * Gd 2 O 3 - 0.0033126 * GeO 2 - 0.0049544 * K 2 O + 0.0045475 * La2O 3 - 0.0023329 * Li 2 O - 0.0026561 * MgO - 0.0035925 * Na 2 O + 0.0071165 * Nb 2 O 5 - 0.0075074 * P 2 O 5 + 0.0015814 * PbO - 0.0043959 * SiO 2 - 0.00086373 * SrO + 0.0045915 * Ta 2 O 5 - 0.0015272 * TeO 2 + 0.0020281 * TiO 2 + 0.0012709 * WO 3 + 0.0025878 * Y 2 O 3 + 0.0048156 * Yb 2 O 3 - 0.00047962 * ZnO + 0.00090073 * ZrO 2 + 1.955, where a symbol "*" means multiplication. • greater than or equal to 3.0 mol.% and less than or equal to 35.0 mol.% WO 3, • greater than or equal to 0.3 mol.% and less than or equal to 50.0 mol.% TiO 2, • greater than or equal to 0.3 mol.% and less than or equal to 50.0 mol.% Nb 2 O 5, • greater than or equal to 0.0 mol.% and less than or equal to 20.0 mol.% Bi 2 O 3, • greater than or equal to 0.0 mol.% and less than or equal to 10.0 mol.% TeO 2, • greater than or equal to 0.0 mol.% and less than or equal to 5.0 mol.% PbO, • greater than or equal to 0.0 mol.% and less than or equal to 3.0 mol.% MoOs, • greater than or equal to 0.0 mol.% and less than or equal to 1.0 mol.% V 2 O 5, • greater than or equal to 0.0 at.% and less than or equal to 5.0 at.% F, • greater than or equal to 0.0 at.% and less than or equal to 1.0 at.% Cl, • greater than or equal to 0.0 at.% and less than or equal to 1.0 at.% Br, • greater than or equal to 0.0 at.% and less than or equal to 1.0 at.% I, • greater than or equal to 0.6 mol.% and less than or equal to 60.0 mol.% TiO 2 + Nb 2 O 5 and • optionally comprising one or more components selected from Al 2 O 3, B 2 O 3, BaO, CaO, Gd 2 O 3, GeO 2, K 2 O, La 2 O 3, Li 2 O, MgO, Na 2 O, P 2 O 5, SiO 2, SrO, Ta 2 O 5, Y 2 O 3, Yb 2 O 3, ZnO and ZrO 2, wherein the glass has • a liquidus temperature, T liq, that is greater than or equal to 850 °C and less than or equal to 1350 °C, and wherein the glass satisfies the conditions: • 1.92 ≤ P n ≤ 2.08 and • P n − 1.437 + 0.0005 * T liq > 0.00, where • P n is a refractive index parameter, calculated from the glass composition in terms of mol.% of the components according to the Formula: P n = -0.0051086 * Al 2 O 3 - 0.0049247 * B 2 O 3 / 0.00034289 * BaO + 0.0086552 * Bi 2 O 3 - 0.0014511 * CaO + 0.0047429 * Gd 2 O 3 - 0.0033126 * GeO 2 - 0.0049544 * K 2 O + 0.0045475 * La2O 3 - 0.0023329 * Li 2 O - 0.0026561 * MgO - 0.0035925 * Na 2 O + 0.0071165 * Nb 2 O 5 - 0.0075074 * P 2 O 5 + 0.0015814 * PbO - 0.0043959 * SiO 2 - 0.00086373 * SrO + 0.0045915 * Ta 2 O 5 - 0.0015272 * TeO 2 + 0.0020281 * TiO 2 + 0.0012709 * WO 3 + 0.0025878 * Y 2 O 3 + 0.0048156 * Yb 2 O 3 - 0.00047962 * ZnO + 0.00090073 * ZrO 2 + 1.955,