I really couldn't say about the whole damage thing, it's not come up but I'm sure it will.
As far as an eye patch goes, I had thought that too but if we take Mao as anything to go on for the future progression on how the Geass works it's very likely that even if Lelouch wore an eye patch or something else like that it will eventually spread to both eyes, assumming that's what happened to Mao. Power rush, power takes over and can't be controlled, power is attempted to be contained again (ie, eyepatch) and the power spreads future (to the other eye)... And honestly, two eye patches just isn't trendy, you know?
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As far as an eye patch goes, I had thought that too but if we take Mao as anything to go on for the future progression on how the Geass works it's very likely that even if Lelouch wore an eye patch or something else like that it will eventually spread to both eyes, assumming that's what happened to Mao. Power rush, power takes over and can't be controlled, power is attempted to be contained again (ie, eyepatch) and the power spreads future (to the other eye)... And honestly, two eye patches just isn't trendy, you know?