Praying Mantis compound eyes?

I have a question about mantis's eyes, how do they see us? is it by that black tick in the huge round eyes? because when i move around the tiny black point/tick inside its eyes always follow, and also why sometimes do the mantis eyes be total black but sometimes the black in the eyes gone? and become normal... show more I have a question about mantis's eyes, how do they see us? is it by that black tick in the huge round eyes? because when i move around the tiny black point/tick inside its eyes always follow, and also why sometimes do the mantis eyes be total black but sometimes the black in the eyes gone? and become normal green..

but in fact, sometimes when mantis fly into our house, and when we saw them , why do their head always turn following our direction? but when we keep them as pet, they don't but they see with its black tick.. i'm confused, i'm really need to find one now, but too hard to find one.. please give serious ans. pls, thanks
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