Hi fin,
I already thought about creating an UI mod for that purpose myself
(however that 's always difficult if you yourself aren't visually impaired)
As as start it would help if you would collect all the difficulties he experiences and post them here in your first post.
We'll see if I or someone else might be able to help with it. Also it might help in forwarding that requests to ZOS
and see if at some point those adjustments get implemented as well.
Please also try to track down his Monitor and the Resolution he 's running the Game at as well as the Game-Settings. Especially those two under Settings -> Video (in the Login or Character-Selection Screen):
Maybe it 's something simply doable with the Native Settings and some
minor adjustments especially since he doesn't seem to be Colorblind.
Cheers!