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Visual after-effects associated with the use of high-resolution visual display units.
  1. D L Smerdon and
  2. H E Willshaw
  1. Birmingham and Midland Eye Hospital.


    A long-lasting visual after-effect associated with the use of a high-resolution green visual display unit (VDU) is described in eight normal volunteers. Its duration to a standard VDU exposure is measured. It is related to the McCollough effect and is thought to be either a fatiguing of green colour-coded edge-detectors or an associative phenomenon. A reduction or loss of the usual foveal peak of the critical flicker frequency (CFF) to red is also described.

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