A glass comprising a plurality of components, the glass having a composition of the components comprising: • greater than or equal to 10.0 mol.% and less than or equal to 40.0 mol.% P 2 O 5, • greater than or equal to 0.5 mol.% and less than or equal to 50.0 mol.% TiO 2, • greater than or equal to 0.5 mol.% and less than or equal to 35.0 mol.% K 2 O, • greater than or equal to 0.5 mol.% and less than or equal to 35.0 mol.% CaO, • greater than or equal to 0.0 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 15.0 mol.% MgO, • greater than or equal to 0.0 mol.% and less than or equal to 10.0 mol.% Al 2 O 3, • greater than or equal to 0.0 mol.% and less than or equal to 4.5 mol.% Li 2 O, • 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 4.0 mol.% RO, • greater than or equal to 0.0 mol.% and less than or equal to 20.0 mol.% for a sum of TeO 2 + SnO 2 + SnO, • greater than or equal to 0.0 mol.% and less than or equal to 15.0 mol.% for a sum of SiO 2 + GeO 2 and • optionally comprising one or more components selected from Na 2 O, WO 3, BaO, SrO, ZnO, PbO, Bi 2 O 3, B 2 O 3, ZrO 2, Tl 2 O, Ag 2 O, Cs 2 O, Ga 2 O 3, La 2 O 3, MoO 3 and Ta 2 O 5, wherein the glass satisfies the condition: • P n − 1.54 + 0.1 * P d > 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 = -0.0043794 * P 2 O 5 + 0.0072428 * Nb z O 5 + 0.0037304 * TiO 2 - 0.00039553 * BaO - 0.0032012 * K 2 O - 0.00060689 * CaO - 0.0024218 * Na 2 O - 0.0014988 * Li 2 O + 0.0028587 * WO 3 + 0.0083295 * Bi 2 O 3 - 0.0031637 * B 2 O 3 - 0.0030702 * SiO 2 - 0.00030248 * ZnO + 0.0020025 * ZrO 2 - 0.0018173 * MgO - 0.0032886 * Al 2 O 3 + 0.0024221 * TeO 2 + 0.0038137 * PbO - 0.0016392 * GeO 2 + 0.0063024 * Tl 2 O + 0.0048765 * Ag 2 O + 1.81451, • P d is a density parameter calculated from the glass composition in terms of mol.% of the components according to the Formula: P d [g/cm 3] = 3.98457 - 0.015773 * Al 2 O 3 - 0.014501 * B 2 O 3 + 0.019328 * BaO + 0.060758 * Bi 2 O 3 - 0.0012685 * CaO + 0.023111 * CdO + 0.0053184 * Cs 2 O + 0.011488 * Ga 2 O 3 - 0.0015416 * GeO 2 - 0.013342 * K 2 O + 0.058319 * La 2 O 3 - 0.007918 * Li 2 O - 0.0021423 * MgO - 0.0024413 * MoO 3 - 0.0082226 * Na 2 O + 0.0084961 * Nb z O 5 - 0.020501 * P 2 O 5 + 0.038898 * PbO - 0.012720 * SiO 2 + 0.013948 * SrO + 0.047924 * Ta 2 O 5 + 0.011248 * TeO 2 - 0.0092491 * V 2 O 5 + 0.028913 * WO 3 + 0.0074702 * ZnO + 0.0096721 * ZrO 2, where RO is a total sum of divalent metal oxides, and a symbol "*" means multiplication. • greater than or equal to 10.0 mol.% and less than or equal to 40.0 mol.% P 2 O 5, • greater than or equal to 0.5 mol.% and less than or equal to 50.0 mol.% TiO 2, • greater than or equal to 0.5 mol.% and less than or equal to 35.0 mol.% K 2 O, • greater than or equal to 0.5 mol.% and less than or equal to 35.0 mol.% CaO, • greater than or equal to 0.0 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 15.0 mol.% MgO, • greater than or equal to 0.0 mol.% and less than or equal to 10.0 mol.% Al 2 O 3, • greater than or equal to 0.0 mol.% and less than or equal to 4.5 mol.% Li 2 O, • 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 4.0 mol.% RO, • greater than or equal to 0.0 mol.% and less than or equal to 20.0 mol.% for a sum of TeO 2 + SnO 2 + SnO, • greater than or equal to 0.0 mol.% and less than or equal to 15.0 mol.% for a sum of SiO 2 + GeO 2 and • optionally comprising one or more components selected from Na 2 O, WO 3, BaO, SrO, ZnO, PbO, Bi 2 O 3, B 2 O 3, ZrO 2, Tl 2 O, Ag 2 O, Cs 2 O, Ga 2 O 3, La 2 O 3, MoO 3 and Ta 2 O 5, • P n − 1.54 + 0.1 * P d > 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 = -0.0043794 * P 2 O 5 + 0.0072428 * Nb z O 5 + 0.0037304 * TiO 2 - 0.00039553 * BaO - 0.0032012 * K 2 O - 0.00060689 * CaO - 0.0024218 * Na 2 O - 0.0014988 * Li 2 O + 0.0028587 * WO 3 + 0.0083295 * Bi 2 O 3 - 0.0031637 * B 2 O 3 - 0.0030702 * SiO 2 - 0.00030248 * ZnO + 0.0020025 * ZrO 2 - 0.0018173 * MgO - 0.0032886 * Al 2 O 3 + 0.0024221 * TeO 2 + 0.0038137 * PbO - 0.0016392 * GeO 2 + 0.0063024 * Tl 2 O + 0.0048765 * Ag 2 O + 1.81451, • P d is a density parameter calculated from the glass composition in terms of mol.% of the components according to the Formula: P d [g/cm 3] = 3.98457 - 0.015773 * Al 2 O 3 - 0.014501 * B 2 O 3 + 0.019328 * BaO + 0.060758 * Bi 2 O 3 - 0.0012685 * CaO + 0.023111 * CdO + 0.0053184 * Cs 2 O + 0.011488 * Ga 2 O 3 - 0.0015416 * GeO 2 - 0.013342 * K 2 O + 0.058319 * La 2 O 3 - 0.007918 * Li 2 O - 0.0021423 * MgO - 0.0024413 * MoO 3 - 0.0082226 * Na 2 O + 0.0084961 * Nb z O 5 - 0.020501 * P 2 O 5 + 0.038898 * PbO - 0.012720 * SiO 2 + 0.013948 * SrO + 0.047924 * Ta 2 O 5 + 0.011248 * TeO 2 - 0.0092491 * V 2 O 5 + 0.028913 * WO 3 + 0.0074702 * ZnO + 0.0096721 * ZrO 2,