Schott SF 58, 405nm - 2325nm
USER
2 1
SQRT(1+B1*wvl^2/(wvl^2-C1)+B2*wvl^2/(wvl^2-C2)+B3*wvl^2/(wvl^2-C3))
0
B1	1.92184332E+00;
B2	5.52191937E-01;
B3	1.11643502E+00;
C1	1.49262604E-02;
C2	6.14139252E-02;
C3	1.23450367E+02;