I do not have Sun Visors on my Plus 4 .With sun the other week streaming in and out of trees ,wondered whether Sun Visors would help.However wondered whether too low anyway,and would obstruct vision
Of course one impact was with sun streaming down I didn't notice speed camera going down hill and round corner ...not too sure if speed limit was 30 or 40mph ...but car behind me was much further back when I glanced up!