Motion and vision: why animals move their eyes

@article{Land1999MotionAV,
  title={Motion and vision: why animals move their eyes},
  author={Michael Francis Land},
  journal={Journal of Comparative Physiology A},
  year={1999},
  volume={185},
  pages={341-352},
  url={https://api.semanticscholar.org/CorpusID:18278126}
}
Some insects (e.g. hoverflies) stabilise their gaze much more rigidly than this rule implies, and it is suggested that the need to see the motion of small objects against a background imposes even more stringent conditions on image motion.
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