Colors and reading.

Does anyone have issues reading anything with black text and a white background? I've just started to read with reverse colors and what wonders it has.
I'm wondering do some brains get better understanding when colors have changed?
Scientific debate get.

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You try to play Rubik Cube with colour cube it will improve your brain.

>>1 Yes
>>2 That's nasty,dude.
>>3 No, it just improves your visual awareness.