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Effect of Striated Fields on Critical Flicker Frequency

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Abstract

Critical flicker frequency measurements were obtained as a function of retinal illuminance for a square centrally regarded field (8.5 degrees on a side) containing various numbers of vertical stripes. The visual field contained under the different experimental conditions 0, 10, 30, 90, and 250 black lines per inch, corresponding to an angular subtense at the eye of 0.63, 0.21, 0.07, and 0.025 degree, respectively. Results indicate that CFF decreases with increases in the number of stripes reaching a minimum at approximately 30 stripes per inch, and then may increase with further increases in the number of stripes. Except at the highest illuminances where the curve for the field containing the largest number of stripes (250 per inch) overtakes that of an unpatterned field, all of the striped fields result in lowered CFF vs log retinal illuminance curves when compared with an unstriped field of the same size.

© 1959 Optical Society of America

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