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There are many situations in daily life where we are exposed to flickering light. This is normally not appreciated because the flicker is so rapid that it is perceived as continuous light. The ability of the human visual system to identify flicker is dependent on the luminance and the chroma of the used stimulating light. The temporal resolution of the human photoreceptors in the central retina, where spatial resolution is optimal, is limited to critical flicker frequencies (CFF) below 50 Hz. Higher CFF values cannot be sensed and therefore are invisible to the naked eye due to the inertia of the human photoreceptors.1
Goldbecker et al 2 compared the four most favoured methods for diagnosing Hepatic Encephalopathy, including CFF. Their results suggest a low diagnostic value of CFF for detection and …
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