"Objects in mirror are closer than they appear". Can mirrors not be improved/refined to be safer?

Because the exterior rear-view mirrors are convex convexed? the objects seem to be closer than they really are.
Although that safety warning tells the drivers this the line may warn the driver, but their brain still has to do some measuring/calculation (imagine drivers that suck at math), would it not be an idea, if possible, to refine mirrors in a way so that the driver sees the object as they are in reality?
Or are there other solutions?