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Having worked in video (in a past life) and doing some experimentation and thinking about this, the white on black is usually easier to read with poor vision. The reason is that the white characters seem (or tend) to ballon outward, giving an apparent larger character. In contrast to this, the black characters tend to shrink into themselves, giving an apparent smaller character.
Whether this is a real or just a perceived change, I don't know but the effect for human eyes is there.
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