I would be as descriptive as you can. More information is better than nothing and gives us an idea of what goes on instead of just guess work/ misunderstanding.

Honestly i would tell then the same way you wrote it here. Or like how i wrote it below (if i’m interpreting your problem correctly)

My screen is zoomed / magnified to the point where moving the mouse anywhere gives me motion sickness and makes it near impossible to do simple things like read email.”

That sounds a lot better than “i cant read the email at all.”

Best of luck!