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Dr Richard Krauzlis, from the Salk Institute in La Jolla, California, focused on the "command centre" in the brain responsible for eye-tracking.
He found that the brain region played an integral part in the mechanism that controlled the movements.
The evidence suggested that the flickering movements were necessary for normal vision, said the researchers, whose findings are reported in the journal scienceresearch shows they are actively controlled by the same brain region used to scan newspaper .
Co-author Dr Ziad Hafed, also from the Salk Institute, said: "Because images on the retina fade from view if they are perfectly stabilised, the active generation of fixational eye movements by the central nervous system allows these movements to constantly shift the scene ever so slightly, thus refreshing the images on our retina and preventing us from going 'blind'."