Why does Tobi keep his left eye hiden

[Illyasviel]

This kinda thread has maybe alredy been made enyway I couldn't find it.

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But if he has one why keep it under a mask?

 

[Kakashii]

who the hell cares?!
now we can see both eyes :shrug:

 

[Mante]

To copy Kakashi..lol..

 

[hinata100]

To copy Kakashi..lol..

lol thats true