i don’t think it will effect the clarity, but the black ds would probably make the screen appear brighter. it would also be easier to distinguish where the edges of the screen are. i would go for darker colours (i think now in america you can get colours like dark blue and maroon? here in australia it’s black, white, light pink or light blue) and try to keep away fromthe lighter colours such as white.
good luck

the darker colors only contrast with the screen more than lighter colors making the screen seem brighter. other wise it doesn’t matter.

Being my brother has not to well eyesight i actually got the white ds lite yeah it might seem odd or to bright but it actually shows up quite well if not the white one i suggest you get the dark or royal blue black tends to make the screen to bright. hope this helps you out.

I personally don’t think there is any impact from the COLOR, but I think white would personally look a lot more clean and crisp than the maroon, pink, and black, don’t you think?

When you buy the DS Lite, there is a brightness scale. This will help a lot. It makes the lighting a lot better than the DS lighting ever was.

Hope this helps.
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Dude its called ligth for a reason just by a black one