^Lelouch explains (in 5 I believe) that the Geass exhibits properties of light, so it can be reflected.
the only reason it didn't work on Mao was because he had reflective glasses. standard glasses and maybe even certain types of sunglasses won't counteract the geass.
and since the emperor doesn't have a name other than the Emperor, his voice actors name, Norio Wakamoto, is occasionally used instead.
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