Don't get why Porsche would not design a sun visor that slides to adjust for side glare. I've had them in my chevy trucks since 07'. Maybe one day I'll perform an autopsy on one and see if I can modify. Annoying at late afternoon here in the south for sure. Unless one is going for the two-tone face tan look. Of course one could install some illegal window-tint I suppose. 
Or maybe some duct tape and a shoe box lid.
Or maybe some duct tape and a shoe box lid.
