Ocelli ( pit-type eyes of arthropods ) blur the image across the whole retina , and are consequently excellent at responding to rapid changes in light intensity across the whole visual field ; this fast response is further accelerated by the large nerve bundles which rush the information to the brain .
They are very good at responding to rapid changes in light intensity across the whole visual field - this fast response is accelerated even more by the large nerve bundles which rush the information to the brain .