the compound eye of an insect, though consisted of many little eyes, does not see well, but like the small sensors in a dslr camera(which uses them for auto focusing), are used for detection of flashes and movements.
why an insect prioritizes movement and flashes of light detection above clear images of the objects?
it's for survival, of course.
they have to react fast when predators approach, so instead of making clearly sure what's approaching, as long as they detect movement, they react and fly away. to focus in the subject to make it clear takes longer time than to register that the subject is moving or approaching. and hence it's logical to enhance the movement detect mechinanism many folds.
evolutionarily, most of the insects are small creatures, so whatever that moves must be very likely bigger than them and on top of them in the food chain.
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