A glass comprising a plurality of components, the glass having a composition of the components comprising: • greater than or equal to 0.3 mol.% and less than or equal to 50.0 mol.% B 2 O 3, • greater than or equal to 0.0 mol.% and less than or equal to 75.0 mol.% P 2 O 5, • greater than or equal to 0.5 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 30.0 mol.% Al 2 O 3, • greater than or equal to 0.0 mol.% and less than or equal to 1.0 mol.% Cu 2 O + CuO, • greater than or equal to 0.3 mol.% and less than or equal to 15.0 mol.% R 2 O, • greater than or equal to 0.0 at.% and less than or equal to 0.5 at.% F, • greater than or equal to 15.0 mol.% and less than or equal to 75.0 mol.% P 2 O 5 + B 2 O 3, • greater than or equal to 0.8 mol.% and less than or equal to 15.0 mol.% R 2 O + RO + SnO 2 + MnO 2 and • greater than or equal to 0.0 mol.% and less than or equal to 5.0 mol.% TeO 2 + GeO 2, wherein the composition of the components is • substantially free of SiO 2 and • substantially free of PbO and wherein the composition of the components satisfies the condition: • (Li 2 O + Na 2 O) / R 2 O [mol.%] ≥ 0.75, where R 2 O is a total sum of monovalent metal oxides, and RO is a total sum of divalent metal oxides, wherein the glass satisfies the condition: • P E > 75, where • P E is calculated from the glass composition in terms of mol.% of the components according to the Formula as defined in the detailed description: P E = -0.27146 * P 2 O 5 + 0.96062 * Al 2 O 3 + 0.22431 * B 2 O 3 - 0.072878 * BaO + 0.35074 * CaO + 0.21526 * (Ce 2 O 3 + CeO 2) - 0.12628 * Cu 2 O - 0.5807 * K 2 O + 0.41579 * La 2 O 3 + 0.18714 * Li 2 O + 0.20336 * MgO + 0.061862 * MnO - 0.057105 * MnO 2 - 0.18615 * Na 2 O + 0.64778 * Nb 2 O 5 - 0.35317 * PbO - 0.028357 * SiO 2 + 0.17429 * SnO + 0.55551 * SnO 2 + 0.8294 * Ta 2 O 5 + 0.60217 * TiO 2 + 0.17356 * WO 3 + 0.36256 * Y 2 O 3 - 0.19958 * ZnO + 0.7835 * ZrO 2 + 0.46259 * (RE m O n - La 2 O 3 - Y 2 O 3 - Ce 2 O 3 - CeO 2) + 0.90549 * (max(0,min(B 2 O 3,P 2 O 5 - (3 * Al 2 O 3 + 3 * RE m O n + R 2 O + MgO + CaO)))) + 70.. • greater than or equal to 0.3 mol.% and less than or equal to 50.0 mol.% B 2 O 3, • greater than or equal to 0.0 mol.% and less than or equal to 75.0 mol.% P 2 O 5, • greater than or equal to 0.5 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 30.0 mol.% Al 2 O 3, • greater than or equal to 0.0 mol.% and less than or equal to 1.0 mol.% Cu 2 O + CuO, • greater than or equal to 0.3 mol.% and less than or equal to 15.0 mol.% R 2 O, • greater than or equal to 0.0 at.% and less than or equal to 0.5 at.% F, • greater than or equal to 15.0 mol.% and less than or equal to 75.0 mol.% P 2 O 5 + B 2 O 3, • greater than or equal to 0.8 mol.% and less than or equal to 15.0 mol.% R 2 O + RO + SnO 2 + MnO 2 and • greater than or equal to 0.0 mol.% and less than or equal to 5.0 mol.% TeO 2 + GeO 2, wherein the composition of the components is • substantially free of SiO 2 and • substantially free of PbO and • substantially free of SiO 2 and • substantially free of PbO and wherein the composition of the components satisfies the condition: • (Li 2 O + Na 2 O) / R 2 O [mol.%] ≥ 0.75, • (Li 2 O + Na 2 O) / R 2 O [mol.%] ≥ 0.75, where R 2 O is a total sum of monovalent metal oxides, and RO is a total sum of divalent metal oxides, wherein the glass satisfies the condition: • P E > 75, • P E > 75, where • P E is calculated from the glass composition in terms of mol.% of the components according to the Formula as defined in the detailed description: P E = -0.27146 * P 2 O 5 + 0.96062 * Al 2 O 3 + 0.22431 * B 2 O 3 - 0.072878 * BaO + 0.35074 * CaO + 0.21526 * (Ce 2 O 3 + CeO 2) - 0.12628 * Cu 2 O - 0.5807 * K 2 O + 0.41579 * La 2 O 3 + 0.18714 * Li 2 O + 0.20336 * MgO + 0.061862 * MnO - 0.057105 * MnO 2 - 0.18615 * Na 2 O + 0.64778 * Nb 2 O 5 - 0.35317 * PbO - 0.028357 * SiO 2 + 0.17429 * SnO + 0.55551 * SnO 2 + 0.8294 * Ta 2 O 5 + 0.60217 * TiO 2 + 0.17356 * WO 3 + 0.36256 * Y 2 O 3 - 0.19958 * ZnO + 0.7835 * ZrO 2 + 0.46259 * (RE m O n - La 2 O 3 - Y 2 O 3 - Ce 2 O 3 - CeO 2) + 0.90549 * (max(0,min(B 2 O 3,P 2 O 5 - (3 * Al 2 O 3 + 3 * RE m O n + R 2 O + MgO + CaO)))) + 70.. • P E is calculated from the glass composition in terms of mol.% of the components according to the Formula as defined in the detailed description: P E = -0.27146 * P 2 O 5 + 0.96062 * Al 2 O 3 + 0.22431 * B 2 O 3 - 0.072878 * BaO + 0.35074 * CaO + 0.21526 * (Ce 2 O 3 + CeO 2) - 0.12628 * Cu 2 O - 0.5807 * K 2 O + 0.41579 * La 2 O 3 + 0.18714 * Li 2 O + 0.20336 * MgO + 0.061862 * MnO - 0.057105 * MnO 2 - 0.18615 * Na 2 O + 0.64778 * Nb 2 O 5 - 0.35317 * PbO - 0.028357 * SiO 2 + 0.17429 * SnO + 0.55551 * SnO 2 + 0.8294 * Ta 2 O 5 + 0.60217 * TiO 2 + 0.17356 * WO 3 + 0.36256 * Y 2 O 3 - 0.19958 * ZnO + 0.7835 * ZrO 2 + 0.46259 * (RE m O n - La 2 O 3 - Y 2 O 3 - Ce 2 O 3 - CeO 2) + 0.90549 * (max(0,min(B 2 O 3,P 2 O 5 - (3 * Al 2 O 3 + 3 * RE m O n + R 2 O + MgO + CaO)))) + 70..