I see. Here is what Mr. google says about simple eyes


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送交者: Latino2 于 2007-03-13, 11:57:05:

回答: 蜜蜂 由 coubert 于 2007-03-13, 11:27:53:

"............ The ocelli can detect only changes in light intensity averaged over their large visual field. Why do insects need ocelli, even though they have sophisticated
compound eyes? Ocelli do have advantages over compound eyes in terms of photic sensitivity and the speed of signal transmission, which are attained
by abandoning spatial resolution. Therefore, ocelli play various roles in the behavior of insects, for examples, they detect the position of the horizon, by monitoring contrast between sky and land, for visual course control
during flight, and also play roles in some visual behaviors in low light conditions. "



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