Flicker Frequency

Simply: The rate at which an image is refreshed and presented to the eye. Generally, humans do not perceive flicker when images are presented at a minimum of 60Hz to 90Hz (frames per second), though this depends on several factors and can be significantly higher. 1 One notable factor for virtual reality is that of peripheral vision which can detect flicker at up to around 200Hz. 2 Humans rely on peripheral vision heavily during eye movement and so an image that looks flicker-free can be perceived as having significant flicker during eye movement. There are many other factors that contribute to the frequency at which the human eye does not perceive flicker including the light wavelength, change in illumination of any point, average illumination, the position of the retina, the recent history of dark adaptation, age, and fatigue. 3

Notes:

  1. James Davis (1986), Humans perceive flicker artefacts at 500 Hz, Wiley
  2. C. (2015). The naked scientists forum | Why do LED tail lights trail to me and not to the rest of my family?. Retrieved December 9, 2016
  3. S.W. Davis, Auditory and Visual Flicker-Fusion as Measures of Fatigue, The American Journal of Psychology, Vol. 68. No. 4. Dec., 1955
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