I saw some comments on the blotches on tinted windows and tough to read LCD screens. This is the case with the way the light is polarized. There is indeed a direction as one poster mentioned. If you can not read an LCD screen, turn the screen 90 degrees and it should become clear. If for some reason you can not turn the screen because it is fixed (i.e. your boat electronics), bend your neck 90 degrees (or as far as it can) and you should be able to read the screen.
If this doesn't work, clean your lenses and repeat