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By R. J. Lythgoe and K. Tansley. Report of the Committee on the Physiology of Vision. Price, 2 shillings, 6 pence. Pp. 72. London: His Majesty's Stationery Office, 1929.

J. B. Lynch, Reviewer

Arch Ophthal. 1930;3(2):252-253.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

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 . . . [Full Text PDF of this Article]

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