Alright fine, if you're going to be all technical about it, we'll do this.
When you go invisible, you go blind.
However due to mother natures sencse of humour, whenever you activate your invisibilty you also begin to activate your eye - mounted sonar, sending out sound and receiving it back and using a super sensative node concealed in your head to paint a mental image with preternatural accuracy in your mind. Now stop talking about invisibility causing blindness, it screws with the fun of it.
Assholes.
