What does CFF stand for?
CFF stands for critical flicker fusion threshold
This definition appears rarely
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Samples in periodicals archive:
Electronic ballasts do not produce light flicker since the phosphor persistence is longer than a half cycle of the higher operation frequency of 20 kHz. The 100–120 Hz flicker produced by magnetic ballasts is associated with headaches and eyestrain.  Individuals with high critical flicker fusion threshold.
The frequency at which the human eye is no longer able to distinguish individual stimuli is defined as the critical flicker fusion threshold. It is at this frequency that the individual stimuli have fused to form a single continuous stimulus. The flicker fusion threshold will vary between individuals depending on their eyesight, hence the use of a number os study participants. It will also vary between an individual’s readings depending on their reaction time at each stage – ie the time at which they actually consciously register that the hitherto flickering stimulus has now become constant and are able to respond to this knowledge.
The aim of this study was to compare 50 mg caffeine, with and without 100 mg L-theanine, on cognition and mood in healthy volunteers. The effects of these treatments on word recognition, rapid visual information processing, critical flicker fusion threshold, attention switching and mood were compared to placebo in 27 participants. Performance was measured at baseline and again 60 min and 90 min after each treatment (separated by a 7-day washout).