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This is a report of a series of tests made on six persons, over a period of several months, with the aid of a photometer measuring the critical frequency of flicker. The apparatus consists essentially of a disk with a sector cut out, rotating in front of a light source until the flickering impression gives way to a sensation of continuous light. This method has been employed to determine the brightness of different parts of the spectrum, and has been used by a number of observers to test the behavior of the eye under different states of adaptation. The critical frequency is expressed in flashes per second ; the expression "a rise in critical frequency" means an increase in the number of flashes per second necessary to produce fusion.
The subject is seated inside a cube with white walls measuring 152 cm., on which were several fixation points
Lynch JB. The Adaptation of the Eye: Its Relation to the Critical Frequency of Flicker. Arch Ophthalmol. 1930;3(2):252–253. doi:10.1001/archopht.1930.00810040130017
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