I kind of figured the more wrinkles the better the byakugan:
To:
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Basically thisI always thought they where veins...
Either way the eye as a muscle can be trained...
More train, less strain.
i agree with thisPossibly means the more wrinkles the more strain. So if you're less practiced you will have more wrinkles if this is true. Might mean nothing and is just an animation choice.