I don't have any personal expertise in which sunglasses are specifically made for "computer" usage, but I'm sure a simple Google search might yield some (possibly) effective results...
Keep in mind, however, that you should avoid using any kind of polarized sunglasses while viewing a monitor/TV/LCD/etc, not only does it create a "rainbow-like" affect to the colors of the display, it also is bad for your eyes, AFAIK.
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