critical fusion frequency

frequency, critical fusion (CFF)

Frequency of a light stimulation at which it becomes perceived as a stable and continuous sensation. That frequency depends upon various factors: luminance, colour, contrast, retinal eccentricity, etc. Syn. critical flicker frequency. See Brücke-Bartley effect; flicker; Ferry-Porter law; Granit-Harper law; Talbot-Plateau law; flicker photometer.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
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Most humans are unable to perceive flicker in light above 60 Hz, but there still remain measurable biological effects above the critical fusion frequency. ERG (electroretinogram) responses indicate that invisible flicker is transmitted through the retina, even up to 200 Hz (Berman,1991).

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