just wondering, cause im doin it right now
No - what is bad for you is having a brighter light behind the screen so that as you look from the screen to the brighter area your iris closes to compensate. as you look back to the screen it dilates for the lower light level. doing this constantly is bad in that it can cause headaches. In a dark room you tend to concentrate only on the screen so this adjustment to different light levels does not happen so often.
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