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Relationship Between Critical Flicker Frequency and Age in Flicker Perimetry
ERNST WOLF;
ANGELA M. SCHRAFFA
Arch Ophthalmol. 1964;72(6):832-843.
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Introduction
In flicker perimetry, a test target well above the limits of visibility with regard to size and luminance is presented at various fixed positions of the visual field. The frequency of the flickering target is lowered from fusion to a level at which flicker becomes perceptible. The critical flicker frequencies (CFF) are determined within the entire field of vision and a distribution pattern of CFF values is obtained which may be diagnostically significant. CFF however, is a function of target size,1 luminance,2 and retinal position,3 light-time/dark-time ratio in each flicker cycle,3,4,5 contrast, wavelength of test light,6,7 and age.8,5,9 In an evaluation of flicker fields each of these parameters must be taken into consideration.
The recognition of flicker does not require the perception of detail. Therefore, while acuity decreases rapidly with the distance from the center of the retina, reliable responses to flicker are
. . . [Full Text PDF of this Article]
Author Affiliations
Boston
Department of Clinical Eye Research, Institute of Biological and Medical Sciences, Retina Foundation; Department of Ophthalmology, Massachusetts Eye and Ear Infirmary; and Harvard Medical School.
Footnotes
Submitted for publication, May 22, 1964.
This investigation was supported by a research grant (B-1482) from the National Institute of Neurological Diseases and Blindness of the National Institute of Health, Public Health Service.
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