This is what I could find for SEQ:
Definition of a prescription in different
Our calculation scheme makes use of
the principle of astigmatic decomposition, which is commonly used in
optical aberration theory. A prescription
in the spherocylindrical form S þ C
(S¼ sphere, C ¼ plus or minus cylinder)
and Y ¼ axis is converted into a component notation (Bennett 1986a, 1986b;
Dunne et al. 1994, 1997):
spherical equivalent (SEQ), the
mean refractive power S þ C/2 which
is constant for any given prescription;
C0 ¼ C Cos(2Y), the projection of
the cylinder to the 0 /180 meridian and,
C45 ¼ C sin(2Y), the projection of
the cylinder to the 45 /135 meridian.
A quick glance makes me think they might use that number for toric contact lenses…
This makes me think they are using + measurements for the cylinder correction - so negative sphere and positive cylinder.
Usually cylinder is measured as a negative value these days. So you may have to convert to cylinder to its negative equivalent before purchasing glasses, depending on where you buy them from…
This website lets you convert cyl from positive to negative: Transpose Rx - VirtualLens 3D
Just looking at it myself, that is pretty high astigmatism for reasonably low myopia…
Astigmatism is a bit different from myopia - it is to do ith the shape of the eye, but not to do with axial elongation in the way that myopia is. A great guide put together from our recently departed Ursa/Hannie is here, and will help you understand the difference:
Working Group on Astigmatism Guide
But do verify what I am saying - I am not an optician and I do not speak german either. I could be way off base. But this is my best effort at interpreting.