I don’t know about you, but I often relied on sunglasses, “shades” when I was driving west in the afternoon. They helped a lot to see the road clearly reducing the extraneous direct light from the sun obscuring my view. The same idea applies to your LCD display. If you keep it shaded from extraneous light in the room where your computer is set-up you will see the image on screen more clearly and free from different and conflicting strays of light. Even in my north-facing room that’s dedicated as my lab, even with special Fobsun LED lamps for my environment lighting, and with a hood protecting the screen, my new Dell Ultrasharp U2410 has a cleaner, brighter screen image now that it has shades.